1Especially in commercial use: flexible, bendable in many ways or directions. More generally: multi-purpose, suitable for a variety of uses or situations.
2North American Sport
In certain games: designating a type of (especially offensive) play suitable for many different situations. Chiefly in "multiflex offence" noun (a) American Football a strategy in which the backs and ends show flexibility in the positions they can adopt; (b) Basketball a strategy notable for the wide repertoire of tactics used on the offense.
1930s; earliest use found in American Home. From multi- + flex-.