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- leg 241
- dolphinfish 69
- spermicide 57
- ebola 61
- scamper 61
- Ecuador 92
- response 482
- studiously 55
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- backwoods 91
- miscarry 85
- helmet 471
- Admiring 127
- faced 57
- raffle 139
- kharif 35
- right on 116
- putter 203
- jangle 112
- Here 171
- mainstreaming 40
- lobotomy 73
- deformed 140
- gyroscope 113
- bing 44
- uttering 26
- pelmanism 40
- b 143
- require 576
- advisedly 70
- blood sport 88
- inefficient 456
- cumulus 120
- trim down 74
- smoke 347
- preseason 55
- probe 341
- git 147
- precede 225
- characteristics 54
- home economics 79
- petrochemistry 32
- arm 320
- outsiderness 30
- bus 270
- successless 48
- googly 74
- Romani 47
- coordinated 147
- taint 135
- Loiter 110
- springtime 426
- frenzied 112
- Convincing 279
- Aristocratic 35
- bacon 158
- advancement 227
- thorn 428
- fundraise 127
- Commission 232
- constitute 158
- upper 485
- goofy 143
- deposition 116
- Told 151
- the subtropics 59
- zest 141
- Complacence 105
- nothing 277
- dereliction 133
- neutrino 49
- fittingly 41
- en suite 141
- Demolition 86
- Existential 61
- luxury 457
- dtp 141
- accomplish 479
- frogging 38
- anchorman 119
- pay raise 55
- osteopath 70
- Tautology 13
- customer 518
- write in 62
- Abalone 128
- wedding 471
- accident-prone 80
- Promiscuous 81
- britpop 47
- Officer 119
- impala 51
- impressionable 217
- Examiner 47
- silver 482
- DNA fingerprinting 75
- cloak 530
- pandemic 141
- edam 73
- ovenware 37
- Eke 139
- vote 519
- passant 39
- mouse mat 62
- Infest 105
- nameable 43
- haute couture 65
- bewilder 209
- occupy 626
- pantsuited 32
- pandal 45
- gallantry 143
- furniture 483
- Alleviating 7
- high street 83
- Sentimental 177
- tuberculosis 181
- coachwork 41
- Affirm 11
- civvies 60
- go with 109
- dirndl 84
- secession 165
- Texture 139
- soporifically 47
- contextual 104
- brag 155
- pheromone 153
- hospitable 96
- long haul 113
- out-of-date 27
- god 227
- serried 51
- Suffrage 99
- Plurality 51
- Call on 35
- armored 124
- hireling 68
- eyesight 472
- loneliness 71
- steamer 502
- changeover 117
- RIOT 224
- disable 431
- slice 585
- deplane 80
- wet suit 64
- mainstream 291
- demonstrate 515
- ambiguously 94
- worthier 31
- industry 568
- dwell on 49
- Surrogate 29
- Consistent 145
- Expansion 245
- cross paths 13
- divorcée 349
- arena 230
- bachelordom 43
- moralist 61
- fido 89
- breeze block 80
- pally 80
- fair 482
- barbarism 155
- jut 214
- drayage 18
- louver 79
- pollination 155
- Full 235
- high streets 45
- Louise, Lake 52
- endowment 194
- typeface 55
- digraph 50
- stink 205
- blank check 105
- latinate 44
- inequality 279
- defend 505
- bounty 124
- hardship 548
- butter 540
- leprosy 66
- dark chocolate 104
- Nature 212
- stand-up 29
- macchiato 55
- airpower 69
- courthouse 123
- unhealthy 80
- wind up 110
- broody 132
- nonsolid 36
- hurricane 72
- check-in 222
- athleticism 192
- rosebush 51
- curatory 42
- landholder 159
- sober 489
- consumable 109
- topple 293
- drumroll 56
- typeset 50
- merry 449
- ragga 56
- drummer 184
- playroom 70
- dispirited 80
- mandible 83
- Armenia 58
- overdressed 55
- Air 210
- piston 116
- flinch 243
- decked 53
- Obsession 151
- celestial 126
- either 209
- wintertime 60
- charmed circle 89
- Embed 68
- german 137
- usufruct 39
- Broom 186
- beetroot 112
- Dilute 201
- sore 563
- communicative 152
- array 314
- conquer 466
- jack-of-all-trades 113
- Mature 218
- hypo 60
- wring 180
- authors 50
- burn down 152
- digital 443
- Ensue 38
- food processor 122
- dye 548
- rascal 192
- colourless 65
- Marshy 131
- expat 148
- Think 197
- mandate 285
- crème fraiche 57
- receiver 529
- thinking cap 58
- rhymed 28
- custard pie 72
- beg 510
- astro- 66
- sanctum 71
- synagogue 56
- lumpy 76
- naked 491
- crashingly 45
- cucumber 554
- crummie 71
- dictum 357
- ascii 93
- yield 487
- room 310
- appreciate 547
- confidential 212
- hypnotise 60
- puffin 122
- furnished 119
- books 58
- profit 589
- deadbeat 86
- Export 268
- Sludge 48
- focus 646
- mobilizer 33
- simper 139
- prattle 71
- supposedly 169
- skid 287
- firstly 93
- chilly 160
- paraffin 109
- tennis 293
- Enraged 25
- tamper 75
- Difficult 207
- teakettle 49
- newfound 64
- preservation 197
- newton 45
- otomi 41
- surpassing 139
- Immediacy 17
- tamarind 42
- cattle 532
- pamphlet 290
- Adagio 54
- cambodian 72
- lake 197
- overwatch 43
- monkey 500
- burn-in 63
- defunct 225
- wickerwork 68
- hyperlink 71
- figure eight 92
- premier 569
- swimwear 75
- industrialize 464
- orientate 214
- cook up 84
- disputed 87
- Handy 145
- gross national product 89
- recur 127
- woe 205
- Consecrate 35
- acid house 84
- good-bye 60
- cash in 87
- bigamy 135
- Stairwell 118
- odourless 102
- QUIET 183
- favored 203
- repudiation 78
- dry-eyed 84
- hung 196
- Puberty 51
- separatist 174
- remarkably 160
- Aneurysm 12
- oversize 78
- famous 137
- maniacal 200
- take out 106
- Invertebrate 43
- system 583
- best 255
- 's 117
- stifling 140
- Shrub 91
- Drop 233
- mouse 580
- heirdom 40
- nosedive 86
- Sec 92
- hacker 113
- backhand 119
- extraordinary 555
- unsociable 57
- distilleries 45
- whilst 422
- firefighter 213
- sausage 540
- docusoap 59
- chilean 69
- smacking 39
- expressionism 184
- Coin 51
- fill 322
- mercenary 244
- wholeheartedly 120
- intriguing 239
- glamorousness 41
- brass 465
- adman 108
- toll free 101
- happiness 499
- stepchild 64
- mollycoddle 73
- pseud 71
- toady 197
- unwound 48
- pinnacle 81
- precognition 142
- drift 483
- cheer up 128
- Staid 21
- cleft 106
- sett 62
- fiberboard 123
- Athlete 183
- end zone 90
- degeneracies 44
- guard's van 91
- poser 64
- ache 446
- guard 564
- northing 43
- lindisfarne 29
- bathhouse 98
- pathology 150
- perry 81
- paint the town (red) 44
- incommensurate 112
- lapdog 71
- herbivore 170
- passably 59
- trash talk 115
- moonlighting 37
- BOYCOTT 99
- cryptocurrency 54
- farsighted 121
- seychellois 47
- falstaffian 56
- accumulator 85
- showdown 59
- soldier 187
- Emerald 35
- spry 89
- synchronization 112
- einsteinium 80
- malicious 122
- chaise lounge 83
- break in 124
- incompatible 94
- sacrificial 75
- Mash 137
- whereby 147
- Exhausted 188
- sharia 48
- Expunge 28
- schools 34
- Flap 147
- epiphany 102
- bumpkinish 45
- duty-free 133
- describe 529
- unnerving 40
- bong 120
- ostracism 80
- flare-up 115
- Conceal 210
- assiduous 144
- paycheck 111
- bad hair day 71
- firepower 107
- establish 574
- loganberry 74
- Teaser 57
- conformity 140
- acme 145
- dive into 57
- hooch 63
- voracity 70
- leotards 34
- bilk 90
- blue 230
- Lethe 34
- ovule 44
- revolving door 39
- map 360
- mosaicked 26
- centerpiece 231
- Transformed 19
- granddad 126
- all 394
- band 583
- swindle 219
- harden 512
- revenge 490
- Gluten 80
- delicious 469
- acidity 118
- Jiggle 64
- Result 358
- chess 443
- biometric 103
- larp 42
- abundance 205
- paraphraser 34
- Abode 155
- vaccinate 208
- destined 138
- mellow 154
- flowery 140
- revealing 244
- postnuptial 52
- loadstone 42
- rain 176
- at worst 32
- frigidity 111
- rivalry 93
- rev 311
- pricey 83
- Biased 132
- Ensure 196
- Hear from 36
- expiration date 108
- author 520
- Sprout 136
- dispense 173
- GUIDE 102
- bilateral 206
- proportional 521
Example Sentences
In the planner's view, Rumsfeld had two goals: to demonstrate the efficacy of precision bombing and to "do the war on the cheap." 
Seymour M. Hersh, New Yorker, 7 Apr. 2003 Vaccines exist, but their efficacy against aerosolized plague is unknown. Sharon Begley et al., Newsweek, 8 Oct. 2001 … efficacy does not have to be demonstrated before homeopathic products are marketed. Alison Abbott et al., Nature, 26 Sept. 1996 questioned the efficacy of the alarms in actually preventing auto theft
Seymour M. Hersh, New Yorker, 7 Apr. 2003 Vaccines exist, but their efficacy against aerosolized plague is unknown. Sharon Begley et al., Newsweek, 8 Oct. 2001 … efficacy does not have to be demonstrated before homeopathic products are marketed. Alison Abbott et al., Nature, 26 Sept. 1996 questioned the efficacy of the alarms in actually preventing auto theft Recent Examples on the Web Keesee said measuring training efficacy is challenging amid divergent community-to-community needs and scant quantifiable targets. Jori Epstein, USA TODAY, 7 Sep. 2022 While vaccine protection decreases over time, boosters re-stimulate the immune system and increase vaccine efficacy again. Martin Finucane, BostonGlobe.com, 7 Sep. 2022 Studies have pointed to such training's efficacy, but some critics argue that the benefits might just come from a placebo effect. Madeline Holcombe, CNN, 5 Sep. 2022 Precise mapping of urban trees can be useful not only for shade mapping but also for understanding the efficacy in tree planting for climatic purposes, according to a report published in 2021 by C40′s Cool Cities Network. Peter Yeung, oregonlive, 4 Sep. 2022 Generally, medical practitioners advise that two or more of these methods should be used in conjunction with one another to increase efficacy. Chloe Taylor, Fortune, 3 Sep. 2022 Testers also evaluate the products at home on factors such as ease of use, flavor, tooth sensitivity, cleaning efficacy (if applicable) and perceived whitening effects. April Franzino, Good Housekeeping, 30 Aug. 2022 That being said, on visual culture, on the recapturing of the conscience of one’s political power and ethical efficacy is becoming a critical and necessary battle. Vogue, 29 Aug. 2022 The handheld tool works just as the name suggests, stamping the skin with ultra-fine pin-pricks designed to increase your topical treatments' efficacy and boost collagen (just like a traditional dermaroller). ELLE, 29 Aug. 2022 See More
Jori Epstein, USA TODAY, 7 Sep. 2022 While vaccine protection decreases over time, boosters re-stimulate the immune system and increase vaccine efficacy again. Martin Finucane, BostonGlobe.com, 7 Sep. 2022 Studies have pointed to such training's efficacy, but some critics argue that the benefits might just come from a placebo effect. Madeline Holcombe, CNN, 5 Sep. 2022 Precise mapping of urban trees can be useful not only for shade mapping but also for understanding the efficacy in tree planting for climatic purposes, according to a report published in 2021 by C40′s Cool Cities Network. Peter Yeung, oregonlive, 4 Sep. 2022 Generally, medical practitioners advise that two or more of these methods should be used in conjunction with one another to increase efficacy. Chloe Taylor, Fortune, 3 Sep. 2022 Testers also evaluate the products at home on factors such as ease of use, flavor, tooth sensitivity, cleaning efficacy (if applicable) and perceived whitening effects. April Franzino, Good Housekeeping, 30 Aug. 2022 That being said, on visual culture, on the recapturing of the conscience of one’s political power and ethical efficacy is becoming a critical and necessary battle. Vogue, 29 Aug. 2022 The handheld tool works just as the name suggests, stamping the skin with ultra-fine pin-pricks designed to increase your topical treatments' efficacy and boost collagen (just like a traditional dermaroller). ELLE, 29 Aug. 2022 See More Word History
Etymology
borrowed from Latin efficācia, from efficāc-, efficāx "capable of fulfilling a function, efficacious" + -ia -y entry 2
First Known Use
13th century, in the meaning defined above
Time Traveler
The first known use of efficacy was in the 13th century 👨🏻🏫 Mr. Ng 韋氏詞典 📚 – mw.mister5️⃣.net
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