| double | (adjective) used of homologous chromosomes associated in pairs in synapsis | Synonyms: bivalent |
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| (adjective) used of flowers having more than the usual number of petals in crowded or overlapping arrangements | - |
| (adjective) having two meanings with intent to deceive | Synonyms: forked |
| (adjective) large enough for two | - |
| (adjective) twice as great or many | Synonyms: doubled, two-fold, twofold |
| (adjective) consisting of or involving two parts or components usually in pairs | Synonyms: dual, duple |
| (adjective) having more than one decidedly dissimilar aspects or qualities | Synonyms: dual, three-fold, threefold, treble, two-fold, twofold |
| (noun) a base hit on which the batter stops safely at second base | Synonyms: two-bagger, two-base hit, two-baser |
| (noun) raising the stakes in a card game by a factor of 2 | Synonyms: doubling |
| (noun) a quantity that is twice as great as another | - |
| (noun) someone who closely resembles a famous person (especially an actor) | Synonyms: image, look-alike |
| (noun) a stand-in for movie stars to perform dangerous stunts | - |
| (adverb) to double the degree | Synonyms: doubly, twice |
| (adverb) two together | - |
| (adverb) downward and forward | - |
| (verb) increase twofold | Synonyms: duplicate |
| (verb) hit a two-base hit | - |
| (verb) do double duty; serve two purposes or have two functions | - |
| (verb) make or do or perform again | Synonyms: duplicate, reduplicate, repeat, replicate |
| (verb) bend over or curl up, usually with laughter or pain | Synonyms: double over, double up |
| (verb) make a demand for (a card or suit) | - |
| doubled | (adjective) twice as great or many | Synonyms: double, two-fold, twofold |
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| doubleheader | (noun) two games instead of one (especially in baseball when the same two teams play two games on the same day) | Synonyms: double feature, twin bill |
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| doubler | (noun) an electronic device that doubles the voltage or the frequency of an input signal | - |
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| doubles | (noun) tennis played with two players on each side | - |
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| (noun) badminton played with two players on each side | - |
| doublespeak | (noun) any language that pretends to communicate but actually does not | - |
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| doublet | (noun) a man's close-fitting jacket; worn during the Renaissance | - |
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| doublethink | (noun) believing two contradictory ideas at the same time | - |
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| doubleton | (noun) (bridge) a pair of playing cards that are the only cards in their suit in the hand dealt to a player | - |
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| doubletree | (noun) a crossbar on a wagon or carriage to which two whiffletrees are attached in order to harness two horses abreast | - |
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| doubling | (noun) raising the stakes in a card game by a factor of 2 | Synonyms: double |
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| (noun) increase by a factor of two | - |
| doubloon | (noun) a former Spanish gold coin | - |
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| doubly | (adverb) to double the degree | Synonyms: double, twice |
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| (adverb) in a twofold manner | Synonyms: in two ways |
| doubt | (noun) uncertainty about the truth or factuality or existence of something | Synonyms: doubtfulness, dubiousness, question |
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| (noun) the state of being unsure of something | Synonyms: doubtfulness, dubiety, dubiousness, incertitude, uncertainty |
| (verb) consider unlikely | - |
| (verb) lack confidence in | - |
| doubter | (noun) someone who habitually doubts accepted beliefs | Synonyms: sceptic, skeptic |
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| (noun) someone who is doubtful or noncommittal about something | Synonyms: agnostic |
| doubtful | (adjective) open to doubt or suspicion | Synonyms: dubious, dubitable, in question |
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| (adjective) fraught with uncertainty or doubt | Synonyms: dubious |
| (adjective) unsettled in mind or opinion | Synonyms: tentative |
| doubtfully | (adverb) in a doubtful manner | Synonyms: dubiously |
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| doubtfulness | (noun) uncertainty about the truth or factuality or existence of something | Synonyms: doubt, dubiousness, question |
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| (noun) the state of being unsure of something | Synonyms: doubt, dubiety, dubiousness, incertitude, uncertainty |
| doubting | (adjective) marked by or given to doubt | Synonyms: questioning, sceptical, skeptical |
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| doubtless | (adverb) without doubt; certainly | Synonyms: doubtlessly, undoubtedly |
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| doubtlessly | (adverb) without doubt; certainly | Synonyms: doubtless, undoubtedly |
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