Definition of "ya"

Lola got a shocked look on her face then said, “Ya need to stop actin' jealous if ya aint, and ya can't control what I do. Ya aint my daddy and ya aint my man. I'll see ya tomorrah after work if ya want. Just give me a call, ya have my number”.

2011, Byron Douglas, chapter 3, in A Journey Through the Life of an Anti-Social‎[64–65]

'Ya, wilt thou!' said Wallace, 'then tak thee that, […] '

1806, Jamieson, Pop. Ballads

Ya, auld man, ye ken fine ye wad like me.

1894, W. G. Stevenson, Puddin' iii.

Ya, bur 'ee did, […]

1896, Ackworth, Clog Shop Chron.