Wiktionary, which I usually find to be more comprehensive and accurate than the commercial dictionaries, lists 'libera' as a word in Esperanto, Galician, Ido, I

Wiktionary, which I usually find to be more comprehensive and accurate than the commercial dictionaries, lists 'libera' as a word in Esperanto, Galician, Ido, Italian, Latin, Portuguese, Romanian, and Spanish. But not English. Regardless, it doesn't seem like a challenging word to me, somebody who has only ever spoken English. I just pronounce it like it's written, "lib-eh-ra", it never occurred to me that this world might be challenging.