As adjectives the difference between polylingual and monolingual
is that polylingual is of or pertaining to multiple languages; multilingual while monolingual is knowing or using a single language.
As a noun monolingual is
a person who knows or uses only a single language; a monoglot.
polylingual
English
Adjective
(
en adjective)
of or pertaining to multiple languages; multilingual
able to use multiple languages monolingual
English
Adjective
(
en adjective)
Knowing or using a single language.
Synonyms
* unilingual
Noun
(
en noun)
A person who knows or uses only a single language; a monoglot.