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- nautical mile 241
- Spontaneous 143
- trek 401
- condition 1653
- localize 31
- rogue 88
- paralysis 341
- Very 53
- pilot 391
- est. 40
- glitzy 190
- asylum 264
- undertaking 1815
- average 289
- drum roll 86
- dispiriting 225
- To make someone worried or nervous 25
- blister 214
- caked 30
- Practical 359
- too much information 33
- Beat 588
- salubrious 47
- colour blindness 120
- vague 307
- radioactive 529
- quarrel with 48
- guck 45
- succeed 346
- Flags thesaurus 29
- Father 137
- Insurance 203
- fallow deer 52
- velcro 27
- hair's breadth 91
- argue 338
- dispassionate 323
- connote 54
- evolutionist 94
- transcendence 23
- Desperate 1031
- cry out for sth 54
- Task 193
- office 149
- Latin 400
- competition 781
- brush-off 287
- Shutdown 268
- sexually transmitted disease 16
- insignificant 525
- Criticism 1127
- distill 60
- Politics 513
- browbeat 160
- national 678
- bumbling 363
- eagle eye 123
- unequivocal 11
- Monster 7
- whip through 96
- glide 333
- dictatorship 400
- conservative 655
- definite 1163
- stranded 648
- pony 20
- tail off 141
- brindled 317
- mood 451
- throw off 20
- breakable 239
- speak up 73
- ounce 446
- planning 516
- come true 29
- drainage 99
- cost-of-living 99
- betting shop 106
- hallmark 426
- Devotion 350
- Inaugurate 509
- you said it! 142
- adductor 71
- operative 320
- arc lamp 47
- antagonise 96
- settlement 1956
- voyage 3050
- pardon 39
- unctuous 850
- resemble 985
- Nutrient 598
- invasion 529
- Teammate 33
- exception 7733
- gang 296
- revolver 1483
- craving 153
- downplay 484
- pressure 1658
- candle 458
- on weekends 62
- corruptible 163
- RAY 19
- qualitative 8
- Check in 110
- encyclical 1443
- phantom 192
- slipper 289
- population 926
- flood out 99
- butt out 72
- depart from sth 46
- bumper car 102
- bullet point 77
- roll out 181
- Encyclopedia 27
- sovereign 4780
- aquaerobics 187
- opportunist 14
- underachiever 436
- exhaustion 671
- cold war 86
- spin 971
- fight down 123
- regulator 529
- slice off 135
- signature 676
- Fireworks and fireworks displays 20
- antidepressant 83
- Commit 528
- gene therapy 81
- come along 193
- turnip 381
- curly brackets 55
- PREDICAMENT 28
- exoplanet 126
- figurine 114
- solace 21
- triumphant 287
- Olympic 27
- bombardment 602
- framework 1491
- dane 48
- First Minister 81
- distillate 281
- licentious 23
- beach ball 75
- nova 27
- rebound 103
- capitulate 269
- Successful 810
- flavorless 183
- magician 858
- Moderation 21
- along with sb sth 24
- push sth back 49
- the mainland 140
- Drunk 119
- Ayurvedic medicine 55
- correspondence course 113
- Recite 20
- babymoon 355
- clientele 126
- Devise 136
- impression 793
- isolation 280
- beauteous 237
- Obligation 1248
- carriageway 393
- Pedestrian 150
- cantabrigian 173
- cakewalk 239
- eclecticism 175
- apartment 717
- terracing 4939
- serve sth up 67
- reckless 1016
- penicillin 19
- hypocritical 122
- uncomfortable 706
- expresso 118
- wit 371
- flip a switch 56
- autocross 156
- consider 801
- organize 725
- hue 81
- Hall 45
- block sth off 104
- Suitably 769
- perishables 123
- fetch 467
- Charity 188
- halfback 195
- emoji 64
- Rabid 26
- bet 317
- share 699
- contrast 968
- substantiate 455
- company 472
- Material 540
- Amenable 541
- expression 1933
- determinist 68
- Wardrobe 1015
- foothold 325
- self-centred 1044
- egalitarian 285
- realistic 390
- lesson 143
- ma 57
- generator 1385
- wedge 37
- edifying 143
- make the fur fly 22
- boil away 62
- competitor 352
- Insulate 47
- beast of burden 74
- Indulge 19
- schedule 1793
- rotten 300
- tight-fisted 17
- dust off 51
- sarcastic 331
- Scour 55
- fuddy-duddy 151
- disadvantage 1191
- swingeing 625
- femme fatale 63
- elasticity 115
- Conclude 605
- administer 836
- savagery 44
- moderate 1377
- untouchable 1339
- drumstick 88
- fine-tooth comb 66
- habit 806
- backstroke 135
- Document 1708
- observant 869
- day school 64
- cast around for 50
- commandment 113
- Statement 6264
- disoriented 838
- airstream 332
- corroboree 31
- Moving 74
- iron out 136
- eat into sth 69
- billet-doux 188
- co-author 80
- flatline 55
- customer service 52
- interchange 255
- Request 108
- gastronome 158
- barbie 60
- Guarantor 24
- truly 481
- try out on 14
- genotype 235
- attention 1783
- Window 152
- Toxic 124
- collective unconscious 50
- instinct 1126
- acquiesce 811
- scram 189
- dispassionately 68
- guidebook 563
- general practitioner 42
- eurocentric 340
- doom and gloom 14
- haunted 299
- bottle opener 87
- Perform 112
- dishonour 697
- clawback 105
- Commissioner 916
- dusk 865
- Standard 233
- clownish 61
- be assured 18
- lefty 21
- lukewarm 668
- everyday 1646
- Allegiance 180
- outer ear 68
- Tourist 220
- sufficiently 328
- judgment 1373
- feedback 1074
- unnecessary 1835
- Sentence 1451
- self esteem 69
- fiscal year 138
- all-singing 31
- changing room 104
- barometer 277
- applet 78
- oncoming 8
- follicular 300
- Rubble 174
- stay out of sth 24
- allomorph 119
- nestle 191
- bring up 98
- improvement 1785
- supplier 369
- absolutely 442
- Temperature 701
- Cunning 67
- acid test 91
- officiate 27
- Appeal Court 86
- part with sth 39
- Trunk 167
- Contrary 100
- Telling 49
- Instalment 956
- mistaken identity 61
- videotape 672
- cut across sth 81
- block vote 92
- property 871
- blackbird 441
- hobo 176
- primate 17
- grief stricken 21
- abductee 134
- volatility 30
- Austrian 340
- bung 45
- anterior 120
- summary 296
- -monger 49
- French dressing 91
- Opt 212
- back passage 35
- PRIEST 23
- fancy 279
- calculation 743
- Saint 292
- colour scheme 99
- gusto 55
- cabriolet 97
- trumpet 299
- naughty 430
- parameter 454
- Race 575
- Language teaching and learning 26
- participate 786
- senility 36
- revealing 339
- ratio 416
- tap sth out 170
- tuck into 64
- Machinery 294
- in time 51
- spoil 448
- refine 383
- amputate 280
- B.C. 392
- presence 1073
- ensure 541
- right on 86
- face up to 50
- race 1142
- edge 965
- Accent 168
- adsl 56
- wrist 310
- basic 355
- besides 331
- ga 105
- sleepy 348
- bliss 317
- kindle 19
- probable 562
- Approval 1241
- Lack 148
- carpet 271
- venture capital 20
- doubtful 285
- forge 213
- Instability 283
- materials 74
- touchdown 366
- Lead 440
- Lawsuit 170
- govern 412
- sarcasm is the lowest form of wit 23
- grand 415
- Replicate 26
- scripture 49
- castor sugar 76
- escort 195
- smartphone 54
- thriving 49
- decongestant 189
- temple 326
- favicon 35
- star-studded 87
- press 665
- pull over 48
- nelly 52
- Bar 290
- Fall back 33
- color scheme 75
- midday 389
- ewe 109
- Inactive 47
- tribute 192
- revolting 27
- irksome 36
- be burning a hole in your pocket 70
- network 479
- Aggregate 415
- quilt 328
- hook 339
- amazing 241
- degree 475
- mayor 471
- autism 132
- dull 389
- Words used to describe people who are quick to argue 18
- full-frontal 138
- Types of word 29
- cross- 23
- paleo 17
- free 412
- climatic 441
- strive 270
- Farm 95
- adverb 389
- ethically 69
- toll 220
- put set pen to paper 29
- contest 465
- plate 98
- musician 992
- poverty-stricken 76
- not cut the mustard 47
- wreck 332
- retreat 745
- choice 396
- writing 411
- loving 116
- make sure 63
- nuclear 248
- Sway 50
- mane 158
- bait 189
- leisure 390
- b-road 35
- jealous 391
- musical 438
- bereave 93
- Diwali 20
- fibre 361
- cross-pollination 98
- county court 97
- import 598
- claim 489
- charge up 64
- a sympathetic ear 52
- bombard 452
- Lust 201
- england 63
- Net 274
- heel 738
- quality of life 54
- grasp 331
- engineering 1222
- belt up 66
- bag 124
- manly 356
- Extraordinary 369
- Master 185
- permanently 882
- englishman 52
- Debris 71
- baby-boomer 31
- immaculate 609
- galactic 342
- payment 461
- foremost 624
- bourgeois 157
- reappear 589
- authoring 331
- Stupid 172
- bhai 36
- rub 945
- desert 364
- bring round 57
B2 If something is optional, you can choose if you want to do it, pay it, buy it, etc.可选择的；非强制的
English is compulsory for all students, but art and music are optional.英语是所有学生的必修课，而艺术和音乐则是选修的。
More examples
Seat-belts are included as standard but electric windows are an optional extra.
My phone came with 20 optional ringtones.
Do come to the party - fancy dress is optional.
There are several optional tours, for which there will be a small charge.
The basic model is quite cheap, but there are a lot of optional extras.
adjective
optional adj.
⇨ voluntary 1
optional
Available and to be, or to become available: available, public, spare...
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