Part of speech: prefix
1. prefixed to n-s conveys the sense of unity, co-operation, simultaneous action: co-; gaarbja co-heir, fellow-heir; 2. prefixed to v-s conveys the sense of: 1) joint action; 2) completed action or perfective aspect; taujan “to do, be doing“ – gataujan “to do, commit, effect”
Etymology
[← Prot-Germ *ga-; OE ȝe-; O Fris je-, ie-, ge-; O Sax gi-; Dt ge-; OHG gi- (Mod G ge-); O Icel g- ← Indo-Europ *kom-; Lat com-; O Ir con-; O Slav съ- (Russ co-)]
