Source : Webster's Revised Unabridged Dictionary (1913)

Intentional \In*ten"tion*al\, a. [Cf. F. intentionnel.]
   Done by intention or design; intended; designed; as, the act
   was intentional, not accidental.

Source : WordNet®

intentional
     adj 1: by conscious design or purpose; "intentional damage"; "a
            knowing attempt to defraud"; "a willful waste of time"
            [syn: {deliberate}, {knowing}, {willful}, {wilful}]
     2: done or made or performed with purpose and intent;
        "style...is more than the deliberate and designed
        creation"- Havelock Ellis; "games designed for all ages";
        "well-designed houses" [syn: {designed}] [ant: {undesigned}]
     3: done by design; "the insult was intentional"; "willful
        disobedience" [syn: {willful}, {wilful}]