G5545 is the noun anointing and occurs exactly three times, all within 1 John 2:20 and 2:27. The recipients have an anointing from the Holy One; the anointing they received remains in them, teaches, is true, and is not a lie. The passage contrasts this assurance with people who left the community and deny the Father and the Son, then calls the recipients to remain in what they heard from the beginning and to remain in him.
Interpreters commonly relate the anointing to the Holy Spirit, received apostolic teaching, or the divine act and endowment by which the community is kept in truth. The noun and these two verses do not by themselves settle every detail of that identification. The phrase about not needing anyone to teach cannot abolish teachers, study, communal discernment, correction, or testing because the letter itself teaches and reminds its readers.
Nor does the anointing grant private infallibility, secret knowledge, immunity from error, office, control over others, or authority to bypass Scripture and accountability. Wider prophet, priest, king, sacramental, or second-blessing connections are contextual theological proposals, not direct G5545 occurrence claims.