IPA: /pəˈstɪəriəli/
KK: /pəˈstɪr.i.ər.li/
In a position that is behind something or at the back; also refers to something occurring later in time.
The doctor examined the patient posteriorly to check for any issues in the back.
Posteriorly → It is formed from "posterior" (from Latin "posterior", meaning later or behind) and the suffix "-ly" (meaning in a manner of). The word "posteriorly" means in a manner that is later or situated behind.
Think of 'posterior' meaning 'behind' — when something happens 'posteriorly', it occurs in a manner that is behind or later.