triplicity
/trɪˈplɪsətɪ/noun
(pl. -ies)
1- rare a group of three people or things〈罕〉三人一组, 三件一套。
1.1
- mass noun archaic the state of being triple〈古〉三倍, 三重。
词源
late Middle English (as a term in astrology)： from late Latin triplicitas, from Latin triplex, triplic- 'threefold' （see TRIPLEX）.