(often childish) Dad, daddy, father; a familiar or old-fashioned term of address to one’s father. / (informal) A pet name for one's grandfather. / A parish priest in the Greek Orthodox Church.

Of or pertaining to the pope or the papacy.

plural of papa

Acronym of Professional and Amateur Pinball Association.

Any pinball tournament held under the auspices of the Professional and Amateur Pinball Association. / (aviation) Acronym of Parallax Aircraft Parking Aid.

plural of PAPA

(idiomatic) A phrase used to encourage someone or something to approach.

(military, slang) command post

plural of Charlie Papa

It is easy to know the biological mother of a child, but difficult to be sure who the biological father is.