We found one dictionary that defines the word in a while:

Phrases: once in a while, every once in a while, (every) once in a while, In a Little While, for the first time in a while, more... ▸ Words similar to in a while ▸ Usage examples for in a while ▸ Idioms related to in a while ▸ Wikipedia articles (New!) ▸ Words that often appear near in a while ▸ Rhymes of in a while ▸ Invented words related to in a while