1) Arriving on the dot 2) Arriving on time 3) At the appointed time 4) Not late 5) On the dot 6) On time 7) Prompt 8) Punctilious 9) Time-sensitive 10) Timely 11) Without delay 1) On the dot 2) On time 3) Prompt 4) Timely 
• (a.) Consisting in a point; limited to a point; unextended. • (a.) Observant of nice points; punctilious; precise. • (a.) Appearing or done at, or adhering exactly to, a regular or an appointed time; precise; prompt; as, a punctual man; a punctual payment.
Punc'tu·al adjective [ French ponctuel (cf. Spanish puntual , Italian puntuale ), from Latin punctum point. See Point .] 1. Consisting in a point; limited to a point; unextended. [ R.] 'This punctual spot.' Milton. « The theory of the ...
[adj] - acting or arriving or performed exactly at the time appointed
adjective acting or arriving or performed exactly at the time appointed; `she expected guests to be punctual at meals`; `he is not a particularly punctual person`; `punctual payment`
strictly observant of an appointed or regular time; not late; prompt. · made, occurring, etc., at the scheduled or proper time: punctual payment. · pertaining to or of the nature of a point. · punctilious.