key=55357&dict=CALD Here, "on" in "later on" is classified as an adverb, with the general sense of "moving forward". Most native speakers probably treat "later on" as a unit, and do not consciously think about the individual meaning of "on". You can't usually substitute "next year on" for "later on".
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pearlseedCalif Jim,
How adorable you are!
pearlseedCalif Jim,Yes, we all know it, but you mustn't say it.
How adorable you are!