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- caution 582
- Informatics 11
- dazed 416
- brim 721
- illuminated 75
- hero 1054
- drop by 301
- something is in the air 49
- Locker 36
- cyclone 312
- concentrate 725
- establishment 872
- liking 190
- landward 214
- principle 1215
- Stressful 285
- tumble 561
- re-evaluate 42
- Artery 166
- Essence 159
- Glint 53
- stick 1311
- everyday 751
- Outgrow 111
- Complicated 217
- Junta 133
- Fake 275
- obey 1042
- truth 1193
- take apart 131
- autobiography 598
- Authoritarian 156
- Practise 193
- address book 153
- sweetness 129
- texting 84
- steer clear (of) 57
- civil 690
- coffee table 144
- sketch 775
- winded 227
- consumer goods 167
- Ability 429
- Bait 87
- californium 124
- matryoshka 89
- surely 558
- comfort 807
- orientation 260
- reverend 91
- preach the gospel 67
- Entirely 276
- Plural 132
- bewail 152
- glorious 684
- deep freeze 146
- convalescence 184
- Exterior 149
- distinguish 962
- Logical 364
- passion fruit 101
- Palmy 104
- daughter 264
- entrenched 171
- bear down 218
- Aid 31
- bale out 6
- let someone stew (in their own juice) 131
- chewing gum 165
- danger money 16
- injunction 114
- sewn 117
- communist 606
- American football 183
- declassified 177
- furnishings 137
- amazement 203
- Simmer 7
- Depend 368
- incriminate 99
- absence 957
- sasquatch 86
- identify 1154
- kaleidoscopic 91
- emasculate 152
- sequinned 93
- think back 86
- cohousing 119
- shears 130
- undershorts 100
- Enemy 581
- aitch 158
- refrigerator 610
- net curtain 111
- dumbwaiter 126
- african 268
- Interpret 340
- ropable 97
- breathe 762
- endurance 291
- Abroad 174
- rain 306
- jackass 101
- wetback 97
- blind alley 155
- practise 827
- repeat 934
- Popular 397
- double-density 191
- Cherished 78
- roadblock 141
- stupefying 127
- Amazed 96
- babe 224
- colouring 200
- eat into 193
- burst 824
- solvent abuse 185
- shirk 261
- dishonesty 194
- OXFAM 83
- reusable 127
- sunlounger 71
- Fishing 289
- zone 1129
- moult 97
- fired-up 249
- overdone 102
- Stagger 162
- Emeritus 12
- satirize 246
- ensign 212
- Upstate 12
- clavicle 130
- merry-go-round 189
- moobs 93
- council house 150
- downvote 126
- Loneliness 254
- play it cool 104
- ADAPT 44
- weary 750
- able 544
- Reconciliation 39
- droplet 144
- ever 283
- duplicity 171
- Relaunch 186
- county seat 137
- sportswoman 109
- consult 959
- Liquid 338
- Blunt 291
- boulevard 247
- smear 444
- sulphur 633
- traumatize 150
- ceiling 731
- glum 652
- biplane 120
- achievement 799
- fluorescent 201
- misuse 368
- Jaguar 105
- clearing 154
- forge ahead 183
- uphill 99
- abbreviation 1161
- shore 953
- shave 736
- Attain 572
- prophesy 154
- wastage 138
- invaluable 211
- POCKET 40
- martinican 93
- lawsuit 161
- separated 289
- center around 43
- waist 712
- Predatory 8
- Give 254
- back issue 158
- go-go 280
- Daunt 133
- Satisfying 165
- Coherent 265
- add up to 221
- curse 841
- enthusiasm 656
- Marvellous 242
- goody bag 101
- assault 441
- Microorganism 186
- salt 892
- Exhaustion 153
- carnivore 210
- midfield 109
- cor 159
- impartial 290
- proposal 755
- appetite 1284
- Panic 535
- institutionalise 107
- Fur 101
- Fed 14
- Embellishment 88
- merseyside 92
- Intoxicating 148
- pulchritudinous 69
- cure 698
- gnarled 182
- RSVP 250
- the first family 140
- e-ticket 158
- hickory 136
- entrance 1028
- reset 230
- Fah 101
- trapshooting 80
- inappropriate 260
- tsunami 452
- wheelwright 94
- lessen 629
- Addictive 283
- other 464
- conceivable 449
- blister 408
- Profound 135
- drop goal 251
- Gripe 139
- stepdad 88
- family room 150
- townscape 104
- quantum 120
- earthquake 662
- fisherman 755
- Mainstream 336
- fraught 263
- jamestown 92
- Types of written note 93
- cadence 224
- dysentery 186
- Meantime 125
- Full of people or things 76
- Litigious 20
- irritate 305
- monogamous 92
- resultant 92
- marvelous 624
- blusher 137
- defender 350
- wince 211
- talkfest 85
- close-down 474
- goat 562
- Mayhem 210
- cross-channel 164
- clear-headed 125
- jaundiced 118
- ophthalmologist 97
- chatty 200
- dynasty 270
- malignant 121
- Words for people according to their dress 8
- sustained 205
- foot-and-mouth disease 166
- modest 973
- Driver 333
- Dynasty 254
- downsize 194
- live 630
- limb 716
- snob 170
- Archipelago 18
- challenger 211
- facility 2593
- rat tail 106
- birdlike 150
- beggar-thy-neighbor 132
- Comparable 114
- unlucky 867
- swagger 178
- plaintiff 275
- sew up 77
- Maiden 6
- premier 772
- cesspit 190
- leathery 207
- exhibition 801
- back passage 161
- disentangle 200
- survive 1046
- slothful 87
- amity 202
- Types of computer 67
- sunset 786
- vaccine 504
- Extended 159
- Longitude 76
- the 236
- reward 1033
- sham 199
- Rampant 73
- Uproar 223
- draughtproof 117
- Rebirth 48
- do for 162
- realign 127
- waiter 739
- crew cut 152
- expendable 238
- Supposed 223
- something 317
- hopping 96
- per annum 113
- caravanning 127
- langoustine 108
- passenger 1044
- imperfect 124
- datasheet 109
- ict 116
- imaginable 339
- Pastry 276
- To meet or to introduce people 113
- triumph 742
- buffet 237
- flipped 114
- filibuster 147
- undermine 371
- armistice 195
- distraction 296
- central 781
- Influencer 170
- reentry 97
- Inquisition 15
- rome 143
- Hostage 168
- Volley 379
- ellipse 129
- cursive 154
- pitch in 159
- foregone conclusion 105
- bream 194
- frost 571
- spill blood 150
- balmy 171
- chook 151
- malicious 192
- dust-up 323
- testamentarily 82
- gangrenous 240
- escalaTor 220
- cold call 182
- made to order 72
- cent 618
- So-called 72
- Glamor 97
- brought 150
- touching 193
- Read 155
- sort 856
- Celestial 65
- simpleton 158
- monophthong 88
- vibration 635
- Poised 300
- blender 173
- Hesitation 117
- arachnophobe 97
- kurd 108
- haste 903
- aggrieved 230
- pedestal 163
- ESTABLISHMENT 350
- pane 602
- cameraphone 118
- seychelles 89
- actively 215
- Social Security number 89
- monk 155
- burnt out 195
- drove 224
- screen 1018
- control 1545
- blockhouse 181
- algebra 574
- ripe 718
- solar 591
- Mogul 187
- Vote 666
- Estuary 73
- exclusive 682
- fiscal cliff 84
- steep 720
- all 1401
- supernatural 234
- cabbagetown 113
- Transportation 337
- Asylum 67
- mod 547
- inhumane 283
- Grin 198
- Smirk 57
- punishment 1046
- chew over 154
- context 914
- maudlin 92
- Wildfire 59
- timorous 103
- caregiver 158
- outstay 104
- nourishing 205
- buck teeth 108
- designate 318
- bit 555
- adhere 636
- cake tin 179
- ribbon 793
- Rehabilitation 166
- Brag 251
- Researcher 210
- naturally 667
- Cruel and unkind 7
- surety 115
- stand up 314
- provide 753
- stop in 90
- haematite 140
- scam 465
- bitten 134
- underappreciated 14
- responsible 720
- explainer 154
- snoop 102
- bomber jacket 171
- flash freeze 150
- emancipation 134
- Terrace 296
- assistant 1060
- Larder 26
- regret 1013
- bleeding edge 134
- get-up-and-go 352
- stove 912
- outlet 964
- civilian 588
- compose 856
- Truce 135
- competition 1459
- viticulture 85
- overmanning 85
- hang out 155
- upgrade 210
- paddle boat 89
- viewpoint 578
- get 952
- artefact 289
- Hang 331
- attend 834
- bedraggled 202
- glitch 236
- wolf 1024
- hurry 361
- slacker 206
- Indiscreet 189
- mudbath 93
- shallow 815
- favourable 643
- ambulatory 139
- Sailing 299
- length 830
- acquaintance 790
- potholing 101
- digital television 135
- bdellium 87
- officer 656
- ultrasonic 78
- carving knife 122
- bandy 185
- discursive 216
- Enquiry 372
- skim 948
- pare 123
- third-degree 42
- refusal 816
- overlook 834
- Readily 141
- yawl 105
- edam 209
- Effective 460
- gambian 121
- bon mot 160
- flesh-colored 165
- privilege 827
- accusation 380
- verbalize 197
- lead-in 352
- admonish 131
- rot 634
optional
★
adjective 
/ˈɒpʃ(ə)nəl/
/ˈɒpʃ(ə)nəl/ - something that is optional is available or possible if you want it, but you do not have to have it or do it 可選的；非強制的
Add 200 grammes of walnuts (optional). 加200克的胡桃（可選）。
The history course is optional, but English is compulsory. 歷史課是選修的，但英語課是必修的。
an optional extra (=something that is available, usually for more money) （通常指需另交費的）額外可選之物 :Remote central locking comes as an optional extra. 遙控中央門鎖是可供選擇的額外配置。
Synonyms and related wordsAvailable and to be, or to become available: available, public, spare...
derived word
optionally
adverb Synonyms and related words
Available and to be, or to become available: available, public, spare...
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