From Californie +‎ -ien.

• IPA^(key): /ka.li.fɔʁ.njɛ̃/

• Audio:

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californien (feminine californienne, masculine plural californiens, feminine plural californiennes)

1. (relational) of California; Californian

• “californien”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012