subsequently

At a later time; afterwards.

adverb

At a subsequent time: after, afterward, afterwards, later, latterly, next, ulteriorly. Idioms: after a while, by and by, later on. See precede/follow.

Definition: afterwards
Antonyms: earlier, former, previously, prior

The adverb has one meaning:

Meaning #1: happening at a time subsequent to a reference time
  Synonyms: later, afterwards, afterward, after, later on
  Derived from adjective: subsequent (meaning #1)