Abundant a. : Fully sufficient; plentiful; in copious supply; -- followed by in, rarely by with.

Example:
What is the most Abundant isotope of oxygen?

Taxonomy
Merriam-Webster Online Dictionary, Dictionary, webster, Word Games, abun, dant, Webster Online Dictionary with audio pronunciations, Middle English, thesaurus, glossary, language, ESL, Search, nt, adjective, Etymology, Anglo-French, Latin.

Defination from the web:
abundant from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Etymology: Middle English, from Anglo-French, from Latin abundant-, abundans, present participle of abundare to abound. Date: 14th century ...