punctual
adj.arriving or happening exactly on time. You use this to describe someone who is not late for meetings or appointments.
adj.arriving or occurring exactly at the scheduled or expected time. Often used to describe a person's reliability in time management.
“He is very punctual and always arrives before the meeting starts.”
“The train is usually punctual, so we should not worry about being late for our flight.”
“Maintaining a punctual schedule is essential for the success of the project, as every team member must synchronize their efforts to meet the final deadline.”
Borrowed from Medieval Latin pūnctuālis (“relating to a point”), from Late Latin pūnctus (“point”) + -ālis (adjective suffix).
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.