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

• unadjustable
• unadjusted
• unadmonished
• unadoptable
• unadorned
• unadulterated
• unadventurous
• unadvisable
• unadvised
• unadvisedly
• unaerated
• unaesthetic
• unaffected
• unaffectedly
• unaffectedness
• unaffecting
• unaffectionate
• unaffiliated
• unaffixed
• unaffordable
• unaffordablity
• unafraid
• unaged
• unageing
• unaggressive