Is Til a word?I didn't understand "til" is a word because there is until and "un" is negative meaning giver.
'til is a legitimate preposition and conjunction that is an aphetic (letter or syllable ellipsed) variant of untill.
-til is an Old Norse / Old English word used as a combining form in Middle English. It was an archaic Old English word; it became a Middle English combining form.
Till is also a variant of untill
until is the Old Norse negator un- plus Old Norse / Old English til
1150–1200; Middle English untill, equivalent to un- (< Old Norse unz up to, as far as) + til