convene [ con- ( com-) = together 一起;ven = to come 来；-e=>“to come together 来到一起”→]vi. gather in one place 集合 / Congress convenes at least once a year.国会每年至少开一次会。

下面是原生词缀co-出现在元音字母及h，gn前的词例。

coagulate [ co- (com-) = together 一起;agulate = to drive 驱使=>“to drive together 驱赶到一块去”→]v. form into a solid mass, especially from liquid (使）结块；（使）凝结 / The blood from a cut soon coagulated.伤口流出的血很快就凝固了。

coerce [co- (com-) = together 一起；ere = to restrain 约束；-e=>“to restrain together 约束在一起”→]vt. force; compel 迫使； 强迫 / The prisoner was coerced into confessing to the crime.犯人被迫认罪

coercion n. 强迫，压制；高压统治 

coercible a. 可强迫的，町胁迫的

coincide [ co- (com-) = together 一 起;in = upon 在…上；cid = to fall 落；-e =>“to fall upon together—起落在…上”→]v.① occupy the same place or time重合；同时发生，时间重合/ The working hours of most businesses coincide.大多数行业的上班 时间是重合的。②agree; bealike相符；一致/ Her opinion co-incides with mine.她的意见与我一致。

coincidence n. 符合，一致；巧合

coincident a. 同时发生的；一致的