Webster's Revised Unabridged Dictionary · 1913

Dilute

Dilute , transitive verb

[Latin dilutus, past participle of diluere to wash away, dilute; di- = dis- + luere, equiv. to lavare to wash, lave. See Lave, and compare Deluge.]

1.
To make thinner or more liquid by admixture with something; to thin and dissolve by mixing.
Mix their watery store. With the chyle's current, and dilute it more. — Blackmore
2.
To diminish the strength, flavor, color, etc., of, by mixing; to reduce, especially by the addition of water; to temper; to attenuate; to weaken.
Lest these colors should be diluted and weakened by the mixture of any adventitious light. — Sir I. Newton

Dilute , intransitive verb

To become attenuated, thin, or weak; as, it dilutes easily.

Dilute , adjective

[Latin dilutus, p. p.]

Diluted; thin; weak.
A dilute and waterish exposition. — Hopkins