First and Prior

First

First adjective - Coming before all others in importance.
Usage example: there are a number of reasons we can't go, but the first is that we don't have the money

Prior and first are semantically related in time topic. In some cases you can use "Prior" instead an adjective "First", when it comes to topics like before.

Nearby Word: firstly

Prior

Prior adjective - Coming before all others in importance.
Usage example: this assignment will be prior to any other work you may have

First and prior are semantically related in before topic. Sometimes you can use "First" instead an adjective "Prior".
Cite this Source
Prior and First. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/first/prior
First & Prior. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/first/prior>.
Prior or First. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/first/prior.
Google Ngram Viewer shows how "first" and "prior" have occurred on timeline