Noun

(en-noun)

The act, process or ability of concentrating; the process of becoming concentrated, or the state of being concentrated.

# The direction of attention to a specific object.

# The act, process or product of reducing the volume of a liquid, as by evaporation.

# The act or process of removing the dress of ore and of reducing the valuable part to smaller compass, as by currents of air or water.

A field or course of study on which one focuses, especially as a student in a college or university.

The proportion of a substance in a whole.

* {{quote-magazine, year=2013, month=July-August, author= Philip J. Bushnell, magazine=(American Scientist)

, title= Solvents, Ethanol, Car Crashes & Tolerance , passage=Surprisingly, this analysis revealed that acute exposure to solvent vapors at concentrations below those associated with long-term effects appears to increase the risk of a fatal automobile accident. Furthermore, this increase in risk is comparable to the risk of death from leukemia after long-term exposure to benzene, another solvent, which has the well-known property of causing this type of cancer.}}

# (chemistry) The amount of solute in a solution measured in suitable units (e.g., parts per million (ppm))

The matching game pelmanism.

Noun

(en noun)

The setting apart or separation of things or people, as a natural process, a manner of organizing people that may be voluntary or enforced by law.

(rfc-sense) (biology) The Mendelian Law of Segregation related to genetic transmission or geographical segregation of various species.

(mineralogy) Separation]] from a mass, and gathering about centers or into cavities at hand through cohesive or adhesive attraction or the [[crystallize, crystallizing process.

(politics, public policy) The separation of people (geographically, residentially, or in businesses, public transit, etc) into racial or other categories (e.g. religion, sex).

(sociology) The separation of people (geographically, residentially, or in businesses, public transit, etc) into various categories which occurs due to social forces (culture, etc).