Emily Dickinson Lexicon

AB-RUPT', a. [L. abruptus, from abrumpo, to break off; of ab and rumpo. See Rupture.]

1. Literally, broken off, or broken short. Hence,
2. Steep, craggy; applied to rocks, precipices and the like.
3. Figuratively, sudden; without notice to prepare the mind for the event; as, an abrupt entrance or address.
4. Unconnected; having sudden transitions from one subject to another; as, an abrupt style. – Ben Jonson.
5. In botany, an abrupt pinnate leaf is one which has neither leaflet, nor tendril at the end. – Martyn.