の間(あいだ)にWhile, During, Between, Period

間(あいだ)に is an expression that can be used with almost any type of word, to highlight that (A) is the period/space within which something else will or did happen/exist. It may also be a period/space 'until' something else will or did happen/exist. It is a combination of the noun 間(あいだ), and the case marking particle に.

When used with verbs or い-Adjectives, 間(あいだ)に will simply follow the verb/adjective. However, の will be required after nouns, while な will be required after な-Adjectives.

When 間(あいだ)に is being used to express the period/space 'until' something happens/exists, it will be paired with まで.

With 間(あいだ)に, the (B) action/location is usually something that can or did happen/exist at a 'specific' point during (A), and does/did not take up the whole time-frame/space of (A). In this way, it can translate more literally as 'in the span of (A)'. This comes from the kanji 間(あいだ)'s common meaning as 'an interval'.