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

• poring over
• pork
• pork and beans
• pork barrel
• pork belly
• pork butcher
• pork loin
• pork roast
• pork sausage
• pork tenderloin
• pork-and-veal goulash
• pork-barreling
• porkchop
• porker
• porkfish
• porkholt
• porkpie
• porkpie hat
• porky
• porky pie
• porn
• porn merchant
• porno
• pornographer
• pornographic