punctual

Short definition from Wiktionary

Adjective

1. 1
   Prompt; on time: Of an event, happening at the appointed time.
2. 2
   Prompt; on time: Of a person, acting at the appointed time.
3. 3
   Existing as a point or series of points.
4. 4
   Expressing a momentary action that has no duration.
5. 5
   Periodic; occasional.
6. 6
   Observing trivial points; punctilious.