What is the meaning of باب?

door, gate

opening, gateway

entrance

gullet, weasand

opportunity, a chance, opening

military tactic, maneuver, an opening to use a strategy

chapter, section, column

group, class, category

appearance of an astronomical body, a juncture, an opening to observe

domain, field

door

door, gate

door

gate

entrance

door

door

Jawi spelling of bab.‎

appropriate

chapter (of a written work)

door, gate

the Báb

father

A transliteration of the English male given name diminutive Bob

Source: wiktionary.org