Definitions from Wiktionary ( )

▸ adjective:  Having one or more defects.
▸ adjective:  (grammar, of a lexeme, especially a verb) Lacking some forms; e.g., having only one tense or being usable only in the third person.
▸ adjective:  (Arabic grammar, of a verb) Having a root whose final consonant is weak (ي, و, or ء).
▸ adjective:  (orthography, of a script) Not capable of representing all the phonemic distinctions of a language it is used to write.
▸ adjective:  (chiefly of abjad script) Spelled without matres lectionis, for example אמץ (ómets, “courage”) as opposed to the plene spelling אומץ where the letter vav ⟨ו⟩ indicates the vowel o.
▸ adverb:  (chiefly of abjad script) Without matres lectionis (letters indicating vowels) written out.
▸ noun:  A person or thing considered to be defective.
▸ noun:  (chiefly of abjad script) A word written without matres lectionis (letters indicating vowels).

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