Nocturnal meaning: If something is nocturnal

If something is nocturnal , it belongs to or is active at night . That includes vampires, owls that like to hunt by moonlight, and that roommate who stays up playing video games until the wee hours of the morning. Nocturnal means of, relating to, or occurring in the night, or most active at night. Learn the origin, synonyms, antonyms, and translations of nocturnal from various sources. Nocturnal definition : of or relating to the night (diurnal ).. See examples of NOCTURNAL used in a sentence. NOCTURNAL meaning : 1 : active mainly during the night ; 2 : happening at night