What is the meaning of œ?

an open-mid front rounded vowel.

[œ]-coloring or a weak, fleeting, epenthetic or echo [œ].

open-rounded labialization, less rounded than IPA ʷ.

A ligature of vowels o and e.

Ligature in French spelling, a combination of o and e

Vowel borrowed from Latin. Succeeded by ö.

Historical Swedish letter, now obsolete and rarely used, replaced by e and ö.

Source: wiktionary.org