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 arrangement of elements into various groups without regard to their order in the group.
a group thus formed. Compare permutation ( def 1 ).

1350–1400; Middle English combinacyoun (< Middle French) < Late Latin combīnātiōn- (stem of combīnātiō), equivalent to combīnāt(us) combined (see combine, -ate1) + -iōn- -ion

combinational, adjective
intercombination, noun
noncombination, noun
precombination, noun
supercombination, noun
uncombinational, adjective

1. association, conjunction, union, coalescence, blending. 2. mixture, amalgamation, amalgam. 4. association, federation, league, coalition, cartel, combine, monopoly, bloc, cabal, conspiracy. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To combinations
World English Dictionary
combination (ˌkɒmbɪˈneɪʃən)
1.  the act of combining or state of being combined
2.  a union of separate parts, qualities, etc
3.  an alliance of people or parties; group having a common purpose
4.  a.  the set of numbers that opens a combination lock
 b.  the mechanism of this type of lock
5.  (Brit) a motorcycle with a sidecar attached
6.  maths
 a.  an arrangement of the numbers, terms, etc, of a set into specified groups without regard to order in the group: the combinations of a, b, and c, taken two at a time, are ab, bc, ac
 b.  Compare permutation a group formed in this way. The number of combinations of n objects taken r at a time is n!/[(n -- r)!r!]. Symbol: nCr
7.  the chemical reaction of two or more compounds, usually to form one other compound
8.  chess a tactical manoeuvre involving a sequence of moves and more than one piece

combinations (ˌkɒmbɪˈneɪʃənz)
pl n
(Brit) combs, Often shortened to: coms, US and Canadian term: union suit a one-piece woollen undergarment with long sleeves and legs

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1530s, from O.Fr. combination (14c., Mod.Fr. combinaison), from L.L. combinationem "a joining two by two," from combinare (see combine).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for combinations
Backtracking attempts to try all the combinations in order to obtain a solution.
A selective list of words with other unusual initial letter combinations
Unfortunately, none of the criteria listed above do so, not even in various
These combinations usually transition into more athletic moves known as power
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