Long ago and One-time

Long ago adverb - Of the distant or comparatively distant past.

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

One-time adjective - Belonging to some prior time.

Long ago and one-time are semantically related. Sometimes you can use "Long ago" instead an adjective phrase "One-time".