perfeito

Perfeito is the Portuguese adjective meaning "perfect" or "complete." The term derives from Latin perfectus, and it has cognates in other Romance languages such as perfecto in Spanish or perfetto in Italian. It is used to describe qualities, conditions, or states regarded as flawless or wholly adequate. It agrees with gender and number: perfeito (masculine singular), perfeita (feminine singular), perfeitos (masculine plural), perfeitas (feminine plural). The adverb form is perfeitamente, used to modify verbs.

In grammar, the word appears in the label pretérito perfeito, a past tense that denotes actions completed in the past. In Brazilian Portuguese, it contrasts with pretérito imperfeito (ongoing or habitual past) and with pretérito mais-que-perfeito. Examples: eu comi (I ate), ela escreveu (she wrote). The distinction can be expressed with different tenses and aspects.

In mathematics, número perfeito refers to an integer equal to the sum of its positive divisors excluding itself, such as 6 (1+2+3) and 28 (1+2+4+7+14). These numbers are studied in number theory and have properties related to their prime factorization.

In everyday language, perfeito is also used as an interjection meaning "Perfect!" or "That's right," as in "Perfeito!" congratulating or confirming a plan or result. Variants include "perfeita" used to describe something flawless.

Overall, perfeito functions as a common adjective with broad utility in descriptive language, grammar labeling, mathematical terminology, and colloquial exclamations, reflecting its roots in the notion of completeness or flawlessness.