One time and One-time

One time adverb - On one occasion.

One-time and one time are semantically related. in former topic. In some cases you can use "One-time" instead an adjective phrase "One time", when it comes to topics like olden, in the past, previous in time or order.

One-time adjective - Belonging to some prior time.

One time and one-time are semantically related. Sometimes you can replace phrase "One time" with "One-time", this phrases are similar.