(rare) to adjoin, to lie next to.
1991, Mauricio Beuchot, La filosofía del lenguaje en la Edad Media, UNAM, page 62:
... se impusieron nombres que pudieran adyacer a los substantivos señalando tales propiedades, a saber, los adjetivos.
... names were set so that they could adjoin substantives and indicate such properties together, namely, adjectives.
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