The 2340s decade covers the period from 2340-2349.
Notable events during the 2340s are the destruction of the Omicron Theta colony by the Crystalline Entity and minor diplomatic successes by the Federation-like mediation between the moons of Peliar Zel and in the Klaestron Civil War. Decisive scientific events include the construction of the Soong-type androids Lore and Data as well as the discovery of the Changeling Odo.
- Starfleet integrates communicator functions into the standard uniform badge by 2344. (TNG: "Yesterday's Enterprise", visual reference)