Definition/Meaning of that's

• English - Contraction: that's (contraction) That is . That's the book I've been looking for. (contraction) That has . I've managed to find the solution to the problem that's been bugging me all day. (contraction, proscribed) That was . Yesterday, that's bugging me all day.
• English - Determiner: that's (Canada, Northern Ireland, US, West Midlands) whose , of which (in dialects that require a human antecedent for 'whose') 2009, Doug Whitman, quoted in Neal Whitman, "We Don't Speak the Same Language" (blog post, 2011 March 23) […] the only one that's title has been released […] 1992, Jim Crace, Arcadia, page 10: He had in his pocket an old flick-knife that's spring was slow and…
• English - Etymology: Etymology 1. From that + 's (contraction of words ending in s). Etymology 2. From that + -'s (possessive marker).
• English - Pronunciation: IPA: /ðəts/ , /ðæts/ Rhymes: -æts