Meaning, pronunciation, example sentences, and more from Oxford Dictionaries. Definition of equity in English: equity. noun. mass noun. 1The quality of being fair and impartial. ' equity of treatment' .. What is the origin of 'sleep tight'?. So read it to understand the right meaning of equity & reap the benefit. If as a Financial Advisor we ask you to invest in Equities or Equity oriented Mutual fund. Equity definition, the quality of being fair or impartial; fairness; impartiality: the equity of Solomon. See more.