<p><strong>Noun</strong></p><ul><li>an extremely plentiful or oversufficient quantity or supply: an abundance of grain.</li><li>Synonyms: plenteousness, copiousness.</li><li>Antonyms: scarcity.</li><li>overflowing fullness: abundance of the heart.</li><li>Synonyms: generosity.</li><li>affluence; wealth: the enjoyment of abundance.</li><li>Physics, Chemistry: the number of atoms of one isotope of an element divided by the total number of atoms in a mixture of the isotopes.</li></ul>