1. Definition: 1. a set of three similar things considered as a unit

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1. Definition: 1. a musical composition written for six performers

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1. Definition: 1. a Russian carriage pulled by three horses abreast

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1. Definition: 1. a set of seven similar things considered as a unit

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1. Definition: 1. the working together of two things (muscles or drugs for example) to produce an effect greater than the sum of their individual effects

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1. Definition: 1. five performers or singers who perform together

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1. Definition: 1. a musical composition for four performers

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1. Definition: 1. cooperative work done by a team (especially when it is effective); "it will take money, good planning and, above all, teamwork"

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1. Definition: 1. a political theory advocating state ownership of industry

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1. Definition: 1. the relation between two different species of organisms that are interdependent; each gains benefits from the other

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1. Definition: 1. a union of interests or purposes or sympathies among members of a group

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