noun
(a) relating one thing to another in the mind
association area = area of the cortex of the brain which is concerned with relating stimuli coming from different sources
association neurone = neurone which links an association area to the main parts of the cortex
association tracts = tracts which link areas of the cortex in the same cerebral hemisphere
(b) group of people in the same profession, with similar interests
see also BRITISH MEDICAL ASSOCIATION