sequenceyoudaoicibaDictYouDict[sequence 词源字典]
sequence: [14] Sequence is at the centre of a large family of English words that go back ultimately to Latin sequī ‘follow’ (others include consecutive [17], consequence [14], ensue, obsequious [15], persecute [15], prosecute, pursue, second, sect, subsequent [15], sue, and suit). Sequence itself comes from late Latin sequentia, a derivative of the present participle sequēns.

Another Latin derivative was sequēla ‘that which follows’, which has given English sequal [15]. Sequī came from the Indo-European base *seq-, which also produced Greek hépomai, Irish sechur, Lithuanian sekti, and Sanskrit sac-, all meaning ‘follow’.
=> consecutive, consequence, ensue, obsequious, persecute, prosecute, pursue, second, sect, sequal, set, sue, suit[sequence etymology, sequence origin, 英语词源]
sequence (n.)youdaoicibaDictYouDict
late 14c., "hymn sung after the Hallelujah and before the Gospel," from Old French sequence "answering verses" (13c.), from Medieval Latin sequentia "a following, a succession," from Latin sequentem (nominative sequens), present participle of sequi "to follow" (see sequel). In Church use, a partial loan-translation of Greek akolouthia, from akolouthos "following." General sense of "succession," also "a sequence at cards," appeared 1570s.
sequence (v.)youdaoicibaDictYouDict
"arrange in a sequence," 1954, from sequence (n.). Related: Sequenced; sequencing.