We found 3 dictionaries that define the word that's why:

General (2 matching dictionaries)

1. That's Why (I Love You So), That's Why (You Go Away), That's Why (album): Wikipedia, the Free Encyclopedia
2. that's why: Wiktionary

Miscellaneous (1 matching dictionary)

3. that's why: Idioms

Definitions from Wiktionary (that's why) ▸ adverb:  a statement to emphasise the reason or explanation just given Phrases: so thats why, opposite of thats why i, more... ▸ Words similar to that's why ▸ Usage examples for that's why ▸ Idioms related to that's why ▸ Wikipedia articles (New!) ▸ Words that often appear near that's why ▸ Rhymes of that's why ▸ Invented words related to that's why