The word 'til' is a direct borrowing and shortening of the preposition and conjunction 'until'. Its core lineage traces back to Old Norse, where 'til' served as a preposition meaning 'to' or 'until'. This Old Norse term is related to Old English 'til', which meant 'good' or 'suitable', suggesting an ancient semantic connection through the idea of a goal or endpoint being 'fitting'. In Middle English, the Old Norse 'til' fused with the related 'und' ('up to') to form 'until', from which the clipped form 'til' later emerged as a common, informal variant. Thus, 'til' carries the condensed historical weight of a directional particle indicating a temporal or spatial limit.

This word is a simplex form. It is a variant or shortening of the word "until," which itself originated from Old Norse "und" (meaning 'as far as, up to') combined with "til" (meaning 'to, until').