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AUTHORITATIVE

1. [s] sanctioned by established authority; "an authoritative communique"; "the authorized biography"

2. [s] having authority or ascendancy or influence; "an important official"; "the captain''s authoritative manner"

3. [s] of recognized authority or excellence; "the definitive work on Greece"; "classical methods of navigation"

similar words

1. [a] official

2. [a] influential

3. [a] standard

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Carol in USA

"Is it correct to use a and an interchangeably in the following sentence? That is a/an historic part of town. If not, which would be the correct determiner?"

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