condense

Short definition from Wiktionary

Verb

1. 1
   To concentrate toward the essence by making more close, compact, or dense, thereby decreasing size or volume.
2. 2
   To transform from a gaseous state into a liquid state via condensation.
3. 3
   To be transformed from a gaseous state into a liquid state.

Adjective

1. 1
   Condensed; compact; dense.