Definitions

1. adjective

relating to or characteristic of a concubine or concubinage

“The concubinal relationship between the king and his mistress was a subject of controversy.”

2. noun

a person who is the concubine of a man

“In ancient China, she was considered a concubinal to the emperor.”

3. noun

a concubine or a concubinage

“The concubinal was a common institution in ancient cultures.”