(mathematics) The branch of mathematics dealing with infinite-dimensional vector spaces, whose elements are actually functions, as well as generalizations such as Banach spaces and Hilbert spaces.

A condition or capability that a system, person or object has to satisfy, fulfill or comply with. / (computing) Any of the functions of a software system, described formally.

A work that can be considered to be of practical use, such as software, encyclopedias, dictionaries and textbooks; it has no point of view and is non-fiction.

Any fresh or processed food claimed to have a health-promoting and/or disease-preventing property beyond the basic function of supplying nutrients

(biology) A reproductive strategy in some amphibians wherein the male will inseminate a fresh newly-dead female corpse, fertilizing the still viable eggs, and then squeezing the corpse to eject the newly fertilized eggs into the water.

plural of functional work

plural of functional reserve

A beverage with added functionality or ingredients and consumed for its supposed health benefits.

plural of functional dependency

plural of functional beverage