Meaning

noun the strength of a solution; number of molecules of a substance in a given volume

noun the spatial property of being crowded together

noun strengthening the concentration (as of a solute in a mixture) by removing diluting material

originFrom New Latin concentrātiō (“(1550) action or an act of coming together at a single place; (1659) extraction or separation of one or more of the metals present in an alloy”). Compare French concentration, Spanish concentración, Italian concentrazione (last quarter of 16th century). Equivalent to concentrate + -ion. By surface analysis, con- + centre + -ate + -ion.

Etymology from Wiktionary, CC BY-SA 3.0