Source : WordNet®

initialled
     See {initial}

initial
     adj : occurring at the beginning; "took the initial step toward
           reconciliation"
     [also: {initialling}, {initialled}]

initial
     v : mark with one's initials
     [also: {initialling}, {initialled}]

initial
     n : the first letter of a word (especially a person's name); "he
         refused to put the initials FRS after his name"
     [also: {initialling}, {initialled}]