Source : WordNet®

by choice
     adj : not by chance [syn: {by choice(p)}]
     adv : with intention; in an intentional manner; "he used that word
           intentionally"; "I did this by choice" [syn: {intentionally},
            {deliberately}, {designedly}, {on purpose}, {purposely},
            {advisedly}, {by design}] [ant: {by chance}, {unintentionally},
            {unintentionally}]