mate

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A checkmate.
• transitive & intransitive verb To checkmate or achieve a checkmate.
• noun One of a matched pair.
• noun A spouse or romantic partner.
• noun Either of a pair of birds or other animals that associate in order to propagate.
• noun Either of a pair of animals brought together for breeding.
• noun Either of a pair of plants, fungi, or other organisms that engage in sexual reproduction or conjugation with each other.
• noun A person with whom one is in close association; an associate.
• noun Chiefly British A good friend or companion.
• noun A person with whom one shares living quarters. Often used in combination.
• noun A deck officer on a merchant ship ranking next below the master.
• noun A US Navy petty officer who is an assistant to a warrant officer.
• intransitive verb To join closely or combine.
• intransitive verb To cause to be united in marriage or a romantic sexual relationship.
• intransitive verb To cause (organisms) to breed or bring (organisms) into close proximity for breeding.
• intransitive verb To become joined in marriage or a romantic sexual relationship.
• intransitive verb To be paired for reproducing; breed.
• intransitive verb To engage in sexual reproduction or conjugation.

from The Century Dictionary.

• To defeat; daunt; confound; stupefy.
• To be confounded.
• To join or match as a mate or as mates, as in marriage or other union.
• To match one's self with or against; vie or cope with.
• To be joined in companionship; form a union; pair: as, to mate with one's like; birds mate in spring.
• To checkmate.
• noun In chess, the state of the king when he is in check and cannot move out of it, the player whose king is so placed losing the game.
• Enfeebled; fatigued; spent.
• Confounded; daunted; dismayed; dejected; cast down.
• Overthrown; fallen; slain.
• noun A familiar associate or companion; one who is associated with another or others in habitual intercourse or action; a fellow; a comrade: often used as the second element in a compound, as in playmate, schoolmate, shipmate.
• noun An equal; a match.
• noun One of a pair; one who or that which corresponds to or is joined with another in a pair; one of a pair of mated persons or animals, male and female, or of matched things; one of two fellows: as, a conjugal mate or partner; these shoes are not mates.
• noun A ship's officer whose duty it is to oversee the execution of the orders of the master or commander, or of his immediate superior.
• noun In the United States navy, an officer of the line not in the line of promotion.
• noun In geometry, the element that is paired with a given element in a correlation.
• In logging, to place together in a raft (logs of similar size); match.
• noun A species of holly, Ilex Paraguayensis; also, its prepared leaves, or the tea-like beverage made from them.
• noun Same as congonha.

from the GNU version of the Collaborative International Dictionary of English.

• noun The Paraguay tea, being the dried leaf of the Brazilian holly (Ilex Paraguensis). The infusion has a pleasant odor, with an agreeable bitter taste, and is much used for tea in South America.
• noun (Chess) Same as checkmate.
• adjective obsolete See 2d mat.
• intransitive verb To be or become a mate or mates, especially in sexual companionship
• transitive verb obsolete To confuse; to confound.
• transitive verb To checkmate.
• noun One who customarily associates with another; a companion; an associate; any object which is associated or combined with a similar object.
• noun Hence, specifically, a husband or wife; and among the lower animals, one of a pair associated for propagation and the care of their young.
• noun A suitable companion; a match; an equal.
• noun (Naut.) An officer in a merchant vessel ranking next below the captain. If there are more than one bearing the title, they are called, respectively, first mate, second mate, third mate, etc. In the navy, a subordinate officer or assistant