Source : WordNet®

by chance
     adv 1: in an incidental manner; "these magnificent achievements
            were only incidentally influenced by Oriental models"
            [syn: {incidentally}, {accidentally}]
     2: through chance, "To sleep, perchance to dream.." [syn: {perchance}]
     3: by accident; "betrayed by a word haply overheard" [syn: {haply},
         {by luck}]
     4: without advance planning; "they met accidentally" [syn: {accidentally},
         {circumstantially}, {unexpectedly}] [ant: {intentionally}]