WordNet
n. (psychology) the performance of some composite cognitive activity; an operation that affects mental contents; "the process of thinking"; "the cognitive operation of remembering" [syn: process, cognitive process, operation, cognitive operation]
Wikipedia
Mental process or mental function are terms often used interchangeably for all the things that individuals can do with their minds. These include perception, memory, thinking (such as ideation, imagination, belief, reasoning, etc.), volition, and emotion. Sometimes the term cognitive function is used instead.
A specific instance of engaging in a cognitive process is a mental event. The event of perceiving something is, of course, different from the entire process, or capacity of perception — one's ability to perceive things. In other words, an instance of perceiving is different from the ability that makes those instances possible.