[kom-buh-ney-shuh n] /ˌkɒm bəˈneɪ ʃən/

the act of combining or the state of being combined.
a number of things combined:
a combination of ideas.
something formed by combining:
A chord is a combination of notes.
an alliance of persons or parties:
a combination in restraint of trade.
the set or series of numbers or letters used in setting the mechanism of a combination lock.
the parts of the mechanism operated by this.
Often, combinations. a suit of underwear in one piece.

the act of combining or state of being combined
a union of separate parts, qualities, etc
an alliance of people or parties; group having a common purpose

(Brit) a motorcycle with a sidecar attached

the chemical reaction of two or more compounds, usually to form one other compound
(chess) a tactical manoeuvre involving a sequence of moves and more than one piece

late 14c., combinacyoun, 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 (see combine (v.)).

1. A set containing a certain number of objects selected from another set.
The number of combinations of r objects chosen from a set of n is
n C r = n! / ((n-r)! r!)
where “n C r” is normally with n and r as subscripts or as n above r in parentheses.
See also permutation.
2. In the theory of combinators, a combination denotes an expression in which function application is the only operation.

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