Webster's Revised Unabridged Dictionary · 1913

Qualify

Qualify , transitive verb

[French qualifier, Late Latin qualificare, from Latin qualis how constituted, as + -ficare (in comp.) to make. See Quality, and -Fy.]

1.
To make such as is required; to give added or requisite qualities to; to fit, as for a place, office, occupation, or character; to furnish with the knowledge, skill, or other accomplishment necessary for a purpose; to make capable, as of an employment or privilege; to supply with legal power or capacity.
He had qualified himself for municipal office by taking the oaths to the sovereigns in possession. — Macaulay
2.
To give individual quality to; to modulate; to vary; to regulate.
It hath no larynx... to qualify the sound. — Sir T. Browne
3.
To reduce from a general, undefined, or comprehensive form, to particular or restricted form; to modify; to limit; to restrict; to restrain; as, to qualify a statement, claim, or proposition.
4.
Hence, to soften; to abate; to diminish; to assuage; to reduce the strength of, as liquors.
I do not seek to quench your love's hot fire, But qualify the fire's extreme rage. — Shakespeare
5.
To soothe; to cure; -- said of persons. [Obsolete]
In short space he has them qualified. — Spenser

Qualify , intransitive verb

1.
To be or become qualified; to be fit, as for an office or employment.
2.
To obtain legal power or capacity by taking the oath, or complying with the forms required, on assuming an office.