Noun

(en-noun)

(chemistry) the incorporation of water molecules into a complex with those of another compound

(biology) the process of providing an adequate amount of water to body tissues

(construction) the chemical reaction by which a substance (such as cement) combines with water, giving off heat to form a crystalline structure in its setting and hardening.

Noun

(en noun)

The act of associating.

The state of being associated; a connection to or an affiliation with something.

* {{quote-magazine, year=2012, month=March-April

, author=(Jan Sapp) , title=Race Finished , volume=100, issue=2, page=164 , magazine=(American Scientist) citation , passage=Few concepts are as emotionally charged as that of race. The word conjures up a mixture of associations —culture, ethnicity, genetics, subjugation, exclusion and persecution. But is the tragic history of efforts to define groups of people by race really a matter of the misuse of science, the abuse of a valid biological concept?}}

(statistics) Any relationship between two measured quantities that renders them statistically dependent (but not necessarily causal or a correlation).

A group of persons associated for a common purpose; an organization; society.