1. Of biological parents not married to each other
   - illegitimately 
2. Of unwed parents
   "he was born out of wedlock"
   - outside marriage

Encyclopedia: Out of wedlock

• athletic game
• athletic sock
• athletic supporter
• clean out
• clean room
• clean slate
• clean-burning
• clean-cut
• clean-handed
• clean-limbed
• clean-living
• clean-shaven
• cleanable
• cleaner
• cleaners
• cleaning
• cleaning device
• cleaning equipment
• cleaning implement
• cleaning lady
• cleaning pad
• cleaning woman
• Anglo-Irish
• Anglo-Jewish
• Anglo-Norman