dilute

American Heritage® Dictionary of the English Language, Fourth Edition

1. v. To make thinner or less concentrated by adding a liquid such as water.
2. v. To lessen the force, strength, purity, or brilliance of, especially by admixture.
3. v. To decrease the value of (shares of stock) by increasing the total number of shares.
4. adj. Weakened; diluted.

Century Dictionary and Cyclopedia

1. To render more liquid; make thin or more fluid, as by mixture of a fluid of less with one of greater consistence; attenuate the strength or consistence of: often used figuratively: as, to dilute a narrative with weak reflections.
2. Hence To weaken, as spirit or an acid, by an admixture of water or other liquid, which renders the spirit or acid less concentrated.
3. To make weak or weaker, as color, by mixture; reduce the strength or standard of.
4. To become liquid or more liquid; become thin or reduced in strength: as, vinegar dilutes easily.
5. Thin; attenuated; reduced in strength, as spirit or color.
6. Weak; paltry; poor.

Wiktionary

1. v. transitive To make thinner by adding solvent to a solution; especially by adding water.
2. v. transitive To weaken, especially by adding a foreign substance.
3. v. transitive, stock market To cause the value of individual shares to decrease by increasing the total number of shares.
4. adj. Having a low concentration.
5. adj. Weak; reduced in strength due to dilution, diluted.

GNU Webster's 1913

1. v. To make thinner or more liquid by admixture with something; to thin and dissolve by mixing.
2. v. To diminish the strength, flavor, color, etc., of, by mixing; to reduce, especially by the addition of water; to temper; to attenuate; to weaken.
3. v. To become attenuated, thin, or weak.
4. adj. Diluted; thin; weak.

WordNet 3.0

1. adj. reduced in strength or concentration or quality or purity
2. v. lessen the strength or flavor of a solution or mixture
3. v. corrupt, debase, or make impure by adding a foreign or inferior substance; often by replacing valuable ingredients with inferior ones