Salutation

From Teflpedia

A salutation (/ˌsælju:ˈteɪʃən/) is a greeting or acknowledgement of another’s arrival, or its written equivalent, e.g. in letters, emails, etc.

Examples in English include "Hi", "Hello", "G'day", "Dear sir or madam", etc.

Salutations in English often depend on the part of the day; good morning / good afternoon / good evening.

Compare valediction.