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HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY
THESAURUS
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WORDNET DICTIONARY

Adjective intentional has 2 senses

• intentional(s = adj.all) knowing - characterized by conscious design or purpose; "intentional damage"; "a knowing attempt to defraud"; "a willful waste of time"
Derived forms noun intention₂, noun intentionality₁

• intentional(a = adj.all) designed - done or made or performed with purpose and intent; "style...is more than the deliberate and designed creation"; "games designed for all ages"; "well-designed houses"
Derived form noun intentionality₁

CIDE DICTIONARY

OXFORD DICTIONARY

THESAURUS

intentional

advised, aimed, aimed at, calculated, conscious, considered, contemplated, contrived, deliberate, deliberated, designed, envisaged, envisioned, intended, knowing, meant, meditated, of design, on purpose, planned, preconceived, premeditated, projected, proposed, purposed, purposeful, purposive, studied, teleological, unforced, voluntary, willful, willing, witting

ROGET THESAURUS

intentional

Intention

N intent, intention, intentionality, purpose, quo animo, project, undertaking, predetermination, design, ambition, contemplation, mind, animus, view, purview, proposal, study, look out, final cause, raison d'etre, cui bono, object, aim, end, the be all and the end all, drift, tendency, destination, mark, point, butt, goal, target, bull's-eye, quintain, prey, quarry, game, decision, determination, resolve, fixed set purpose, settled purpose, ultimatum, resolution, wish, arriere pensee, motive, teleology, intended, intentional, advised, express, determinate, prepense, bound for, intending, minded, bent upon, at stake, on the anvil, on the tapis, in view, in prospect, in the breast of, in petto, teleological, intentionally, advisedly, wittingly, knowingly, designedly, purposely, on purpose, by design, studiously, pointedly, with intent, deliberately, with one's eyes open, in cold blood, for, with a view, with an eye to, in order to, in order that, to the end that, with the intent that, for the purpose of, with the view of, in contemplation of, on account of, in pursuance of, pursuant to, quo animo, to all intents and purposes, The road to hell is paved with good intentions, sublimi feriam sidera vertice.

For further exploring for "intentional" in Webster Dictionary Online