Dictionary.net

Density of a substance.

State of density.

Thickness, solidity; also the degree of solidity of a body; the degree of closeness of aggregation of the particles which compose a substance. [Lat.]

n. Condition of standing together, or being fixed in union; —a degree of firmness or density; —a combination; firmness of constitution or character; —agreement or harmony; congruity.

State with respect to material existence ; degree of denseness or rarity ; substance, form ; agreement with itself, or with any other thing.