As far as I know, both words mean the same — “late”. Is there any difference in their meaning? And also how are they used in a sentence?
"Tard" is an adverb, while "retard" is a noun. "Retard" actually means "lateness" or "delay". Some examples:
- It is late: Il est tard
- Please forgive us for this delay: Veuillez nous excuser pour ce retard
- To arrive late: Arriver en retard (arrive with some delay) or Arriver tard (arrive late in the evening, for example)