[n] the act of increasing the density of something
[n] (psychoanalysis) an unconscious process whereby two ideas or images combine into a single symbol; especially in dreams
[n] a shortened version of a written work
[n] the process or result of becoming smaller or pressed together; "the contraction of a gas on cooling"
[n] atmospheric moisture that has condensed because of cold
[n] the process of changing from a gaseous to a liquid or solid state