| couple | (noun) a pair who associate with one another | Synonyms: duet, duo, twosome |
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| (noun) a pair of people who live together | Synonyms: match, mates |
| (noun) (physics) something joined by two equal and opposite forces that act along parallel lines | - |
| (noun) two items of the same kind | Synonyms: brace, couplet, distich, duad, duet, duo, dyad, pair, span, twain, twosome, yoke |
| (noun) a small indefinite number | - |
| quadruple | (noun) a quantity that is four times as great as another | - |
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| (noun) a set of four similar things considered as a unit | Synonyms: quadruplet, quartet, quartette |
| quintuple | (noun) a set of five similar things considered as a unit | Synonyms: quintet, quintette, quintuplet |
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| scruple | (noun) an ethical or moral principle that inhibits action | - |
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| (noun) uneasiness about the fitness of an action (particularly for reasons of ethics, morals or propriety) | Synonyms: misgiving, qualm |
| (noun) a unit of apothecary weight equal to 20 grains | - |
| thermocouple | (noun) a kind of thermometer consisting of two wires of different metals that are joined at both ends; one junction is at the temperature to be measured and the other is held at a fixed lower temperature; the current generated in the circuit is proportional to the temperature difference | Synonyms: thermocouple junction |
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