In a way which excludes something or, more commonly, some people.
Exclusively is an adverb.
it means 1. as the only one or ones 2. exclusively or only 3. merely
Yes. An adverb is a word that modifies a verb. As 'exclusively' modifies a verb, it is an adverb.
but
The word extenuating (thinning out) is used to mean "mitigating", referring to details that lessen the effect or severity of a situation. It is almost exclusively used with the words "circumstances," "factors," or "reasons."
remember exclusively
interrogative
No.
That means they exclusively eat insects.
If you mean the Northwestern United States, there is no one language that is spoken exclusively, but English is the most widely spoken.
No, of is not an adverb. The word of is exclusively a preposition, but sometimes is separated from its object (e.g. what is that bolt a part of?).
That is a connotation of the term. The original meaning is unusual, curious, or odd. Through its application to places and customs that are outmoded, and therefore strange, the word is now applied almost exclusively to mean nostalgically appealing.