1 : near that place or time. 2 : near that number, degree, or quantity a boy of 18 or thereabouts.

What is meant by the term retrospectively?

in a way that relates to or involves thinking about something that happened in the past: Retrospectively, I can see where we went wrong.

Is it thereabout or thereabouts?

As adverbs the difference between thereabouts and thereabout

is that thereabouts is while thereabout is near that place, time or date.