essential or central; of great importance or relevance. / Serving as an instrument, medium, means, or agency.

(mathematics) Any function that has an exponent as an independent variable.

An automatic mental state in which a person continues to drive a vehicle safely and correctly but without the recollection of having done so.

(US) (Southern) A semilunar pastry with either a sweet or savory filling, formed by placing a dollop of filling onto a circular piece of biscuit-style dough and then folding it over and crimping it...