intralinguistic variation.    From Wordnet, Princeton University. 

This arrangement provides an account of synonymy (both interlinguistic and intralinguistic) and equivocation in spoken and written language.    From Wordnik.com.  [William of Ockham] Reference

In order to understand how a wine can taste feminine or aggressive, we rely on intralinguistic associations.    From Wordnik.com.  [VERBATIM: The Language Quarterly Vol XVIII No 3] Reference