SYNE Meaning of SYNE in English [syne] adv [ME (northern), prob. fr. ON sithan; akin to OE siththan since--more at since] (14c) chiefly Scot: since then: ago [2]syne conj or prep (14c) Scot: since Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012