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Portuguese word precisar comes from Portuguese -ar, Portuguese preciso
-ar (Portuguese)
Forms the first-person singular infinitive of first-conjugation verbs. Forms the impersonal infinitive of first-conjugation verbs. Forms the third-person singular infinitive of first-conjugation verbs Forms adjectives from nouns, especially those that already contain an L; -ar.
preciso (Portuguese)
Accurate (which hits the target). Necessary. Precise; accurate (in exact or careful conformity with the truth).
precisar (Portuguese)
(transitive) to need, to must.