1. a female demon or supernatural entity in folklore that appears in dreams and takes the form of a woman in order to seduce men, usually through sexual activity.. Compare incubus.
2. any demon or evil spirit.
3. Slang: a strumpet or prostitute.
4. Slang: a sexually attractive woman.
Etymology: from Mediaeval Latin, from Late Latin succuba, “harlot”, from Latin succubāre, “to lie beneath”, from sub-, “under” + cubāre, “to lie”.