Noun
1. (psychoanalysis) an unconscious process whereby two ideas or images combine into a single symbol; especially in dreams
2. the process of changing from a gaseous to a liquid or solid state
3. atmospheric moisture that has condensed because of cold
4. the process or result of becoming smaller or pressed together;
"the contraction of a gas on cooling"5. a shortened version of a written work
6. the act of increasing the density of something