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

• low-spirited
• low-spiritedness
• low-sudsing
• low-tech
• low-tension
• low-toned
• low-voltage
• low-warp-loom
• low-water mark
• lowan
• lowball
• lowborn
• lowboy
• lowbred
• lowbrow
• lowbrowed
• lowbush cranberry
• lowbush penstemon
• Lowell
• Lowell Jackson Thomas
• Lowell Thomas
• lower
• lower berth
• lower bound
• Lower California