| Definition -
Pertaining to a group of syntactically related words of which at least one has the same function as that performed by the whole group.
For example, the noun shoe in the noun phrase the old shoe is endocentric because it has the same grammatical function as the noun phrase.
1. As opposed to exocentric, which pertains to a group of syntactically related words of which none of them individually has the same function as that performed by the group as a whole.
For example, none of the words in the phrase on the table is an adverb, yet as a group they form a phrase that functions like an adverb.
Etymology - The word derives from the Greek endon, inside + kentrikos, pertaining to a center.