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
Principal is a synonym for first in foremost topic. In some cases you can use "Principal" instead the word "First" as an adjective or a noun, when it comes to topics like characteristic, comparison, main, important. popular alternative
Nearby Word: firstly
Principal
Principal adjective - Coming before all others in importance.
Usage example: our principal reason for coming here today
First is a synonym for principal in main topic. You can use "First" instead the word "Principal" as an adjective or a noun, if it concerns topics such as characteristic, comparison, important, premier. popular alternative
Mutual synonyms
How words are described
Cite this Source
Principal and First. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/first/principal
First & Principal. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/first/principal>.
Principal or First. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/first/principal.
Google Ngram Viewer shows how "first" and "principal" have occurred on timeline