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From The Collaborative International Dictionary of English v.0.48:
kickoff \kickoff\ n. (Football) 1. A kick from the center of the field to start a football game or to resume it after a score. [WordNet 1.5] 2. the time at which an event or activity begins. Syn: beginning, commencement, first, outset, start, starting time, offset. [WordNet 1.5]