[{"Bold_text": "noun", "List Items": ["an extremely plentiful or oversufficient quantity or supply:an abundance of grain.Synonyms: plenteousness , copiousness Antonyms: scarcity", "overflowing fullness:abundance of the heart.Synonyms: generosity", "affluence; wealth:the enjoyment of abundance.", "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."]}]