Real Dictionary

-kinesis in American English
suffix: a combining form with the general sense “movement, activity,” used in the formation of compound words, often with the particular senses “ reaction to a stimulus” (photokinesis), “movement without an apparent physical cause” (telekinesis), “activity within

kinesis in American English
physical movement, esp. involuntary random movement resulting from a particular stimulus
noun: the movement of an organism in response to a stimulus, as light

kinesis in British English
noun: the nondirectional movement of an organism or cell in response to a stimulus, the rate of movement being dependent on the strength of the stimulus