Later is a way to talk about time: some time after now. You can go to a movie later tonight.

Later can also mean more recent, as in "Which is the later movie, Gone with the Wind or Citizen Kane?" It can mean toward the end: “He made that movie later in his career.” It can also mean after, as in "You were later than I thought you'd be!" It can also be used in comparison: "He was late; I was later." All these uses are about time, and how time keeps moving on from now to later.

Definitions of later

adv happening at a time subsequent to a reference time

“he's going to the store but he'll be back here later
after, afterward, afterwards, later on, subsequently

adv at some eventual time in the future

“I'll see you later
by and by

adv comparative of the adverb `late'

“he stayed later than you did”

adj coming at a subsequent time or stage

posterior, ulterior
following in time or order

adj at or toward an end or late period or stage of development

“a later symptom of the disease”
later medical science could have saved the child”
comparatively late in a course of development
late-occurring (especially with reference to symptoms of a disease)
being or occurring at an early stage of development
archaic, primitive
little evolved from or characteristic of an earlier ancestral type
new, young
(of crops) harvested at an early stage of development; before complete maturity
crude, primitive, rude
belonging to an early stage of technical development; characterized by simplicity and (often) crudeness
embryonic, embryotic
in an early stage of development
inchoate, incipient
only partly in existence; imperfectly formed
appearing or developing early
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