An Etymological Dictionary of Astronomy and Astrophysics

General: (v.tr.) To reduce the volume of, to make more concise. (v.intr.) To become more compact, to undergo condensation.
Physics: To cause a gas or vapor to change to a liquid. To remove water from a substance.

Etymology (EN): L. condensare “to make dense,” from → com- intensive prefix + densare “make thick,” from densus, → dense.

Etymology (PE): Cagâlidan from cagâl “dense, thick,” of unknown etymology, + -idan infinitive suffix.