| 单词 | combination |
| 释义 | Word Frequency combination(ˌkɒmbɪˈneɪʃən) noun 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. British a motorcycle with a sidecar attached 6. mathematics 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. a group formed in this way. The number of combinations of n objects taken r at a time is n!/[(n – r)!r!]. Symbol: nC r Compare permutation (sense 1)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 Derived forms combinational (ˌcombiˈnational) adjective |
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