performant UK /pəˈfɔːmənt/US /pɚˈfɔɹmənt/adjective 3noun 1forms 3 adjective3 •Performing well; Capable of or characterized by a high or excellent level of performance or efficiency.The inhabitants commonly use pacing Naggs, singularly performant in travaille, and easily kept in good case. — 1680 •Characterized by a level of performance or efficiency that is adequate for or exceeds the expectations of end users.The program ALGOLOG is highly performant: it generated 259 linear subproblems, instead of 2²³. — 1977 •Of or relating to performance. noun1 •(rare) Someone who performs something, such as a ritual; a performer.If a performant happens to be on unfriendly terms with any one in the village, the performant does everything to get him reconciled long before the preparation is taken in hand. — 1979 formsperformants · more performant · most performant