Etymology
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combination (n.)

late 14c., combinacyoun, "act of uniting (two things) in a whole; state of being so united," from Old French combination (14c., Modern French combinaison), from Late Latin combinationem (nominative combinatio) "a joining two by two," noun of action from past participle stem of combinare "to unite, yoke together," from Latin com "with, together" (see com-) + bini "two by two," adverb from bi- "twice" (from PIE root *dwo- "two").

Sense of "a whole formed by uniting" is from 1530s; specific sense of "union or association of persons for the attainment of some common end" is from 1570s. Meaning "series of moves required to open a combination lock" is from 1880; combination lock, one requiring a certain combination of moves to open it, is from 1851. Related: Combinational.

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Definitions of combination

combination (n.)
a collection of things that have been combined; an assemblage of separate parts or qualities;
combination (n.)
a coordinated sequence of chess moves;
combination (n.)
a sequence of numbers or letters that opens a combination lock;
he forgot the combination to the safe
combination (n.)
a group of people (often temporary) having a common purpose;
they were a winning combination
combination (n.)
an alliance of people or corporations or countries for a special purpose (formerly to achieve some antisocial end but now for general political or economic purposes);
combination (n.)
the act of arranging elements into specified groups without regard to order;
combination (n.)
the act of combining things to form a new whole;
Synonyms: combining / compounding
From wordnet.princeton.edu