By a great interval, widely. of inequality or unlikeness. Often with comparatives or superlatives; sometimes more emphatically far (and) away. Also…

Premodifying a word expressing quantity or extent: fully, quite. Obsolete.

Chiefly Scottish in earlier use. To the full extent or amount; fully, completely. Frequently in the context of measurement; cf. sense A. 6a. Obsolete.

To a large extent or degree; considerably, extremely; spec. (a) so as to be far from what is correct, desired, or intended; so as to err in opinion…

By far, very much. dialect.

plural. As adverb. Many times, far.

Originally U.S. At or by a considerable distance, far. Preceding too or a comparative adjective or adverb: by a great amount; much, far.

plural. As adv. qualifying comparative or (U.S.) positive adjectives: much; very. colloquial.