1. Acting, arriving or performed exactly at the time appointed
   "she is always on time for class";
   - punctual, on the dot
    
2. Payable in installments within a designated period of time
   "we were short of cash, so we purchased our refrigerator on time"

1. At the expected or proper time
   "she always arrives on time";
   - punctually

See also: due, prompt, timely

Antonym: unpunctual