Definition of selectional adjective from the Oxford Advanced American Dictionary

 

selectional

 adjective
adjective
NAmE//səˈlɛkʃənl//
 
(linguistics)
 
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used to describe the process by which each word limits what kind of words can be used with it in normal language “Eat” has the selectional restriction that it must be followed by a kind of food, so “I eat sky” is not possible.
See the Oxford Advanced Learner's Dictionary entry: selectional