adjective/sɔ.li.tɛʁ/
solitary, alone (living alone or being by oneself)
“guêpe solitaire”
Related: solitairement
Learned borrowing from Latin sōlitārius. In Middle and Old French there existed the words soltain, soutain, inherited from Vulgar Latin *sōlitānus, from Late Latin sōlitāneus.