What does "compact" mean?

Additional senses

1. 2.Closely or firmly united, as the particles of solid bodies; firm; close; solid; dense. Glass, crystal, gems, and other compact bodies. Sir I. Newton.
2. 3.Brief; close; pithy; not diffuse; not verbose; as, a compact discourse.
3. 4.To thrust, drive, or press closely together; to join firmly; to consolidate; to make close; -- as the parts which compose a body. Now the bright sun compacts the precious stone. Blackstone.
4. 5.To unite or connect firmly, as in a system. The whole body fitly joined together and compacted by that which every joint supplieth. Eph. iv.
5. 6.An agreement between parties; a covenant or contract. The law of nations depends on mutual compacts, treaties, leagues, etc. Blackstone. Wedlock is described as the indissoluble compact. Macaulay. The federal constitution has been styled a compact between the States by which it was ratified. Wharton.