unofficial

UK: ˌʌnəˈfɪʃ(ə)l | US: ˌʌnəˈfɪʃ(ə)l

Definition

  1. adj. not formally authorized or confirmed by an authority

  2. adj. not part of a recognized or conventional system

  3. adj. informal in nature or origin

Structure
un <not>official <authorized>
Etymology

The word "unofficial" combines the prefix "un-" (Old English "un-," meaning "not") with "official" (from Latin "officium," meaning "duty" or "service"). The prefix negates the root, creating a term that describes something lacking formal approval or recognition. Over time, "official" evolved through Old French ("oficiel") into Middle English, retaining its core meaning of authority, while "un-" consistently inverts it.

Examples

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