formerly also enterlace, late 14c. (trans.), "unite by crossing the laces," thus, "entangle, bind together," from Old French entrelacier (12c.), from entre- (see entre-) "between" + lacier "to tie, entangle," from laz (see lace (n.)).
Intransitive sense from 1590s. Television sense is from 1927. Related: Interlaced; interlacing; interlacement. The noun is 1904, from the verb.