(n.) A government by seven persons; also, a group of seven governments\.

Heptateuch Spenserian stanza antistrophe bipartisanship book burden canto chorus coaction coadjuvancy coadministration coagency cochairmanship codirectorship collaboration collaborativeness collectivism collusion commensalism common effort common enterprise communalism communism communitarianism community complicity concert concord concordance concurrence cooperation cooperativeness couplet distich duet duettino duo duumvirate ecumenicalism ecumenicism ecumenism ensemble music ensemble singing envoi epode esprit esprit de corps fellow feeling fellowship harmony heptachord heptad heptagon heptahedron heptameter heptarchy heptastich hexastich joining of forces joint effort joint operation line mass action measure monostich morale mutual assistance mutualism mutuality octastich octave octet ottava rima part music part singing part song pentastich polyphonic music pooling pooling of resources pulling together quartet quatrain quintet reciprocity refrain rhyme royal septennate septuor sestet seven sevener sextet solidarity stanza stave strain strophe syllable symbiosis synergism synergy team spirit teamwork tercet terza rima terzet terzetto tetrastich trio triplet tristich triumvirate troika united action verse week