1. Definition: 1. activities associated with sexual intercourse; "they had sex in the back seat"

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1. Definition: 1. neckwear consisting of a long narrow piece of material worn (mostly by men) under a collar and tied in knot at the front; "he stood in front of the mirror tightening his necktie"; "he wore a vest and tie"

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1. Definition: 1. the male reproductive cell; the male gamete; "a sperm is mostly a nucleus surrounded by little other cellular material"

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1. Definition: 1. of trade unions; "the union movement"; "union negotiations"; "a union-shop clause in the contract"

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1. Definition: 1. joint made by overlapping two ends and joining them together

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1. Definition: 1. an interruption of normal activity

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1. Definition: 1. a fastener that serves to join or connect; "the walls are held together with metal links placed in the wet mortar during construction"

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1. Definition: 1. the act of sexual procreation between a man and a woman; the man's penis is inserted into the woman's vagina and excited until orgasm and ejaculation occur

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1. Definition: 1. the relation between two different species of organisms that are interdependent; each gains benefits from the other

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