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apologetics (used with a sing. verb) the branch of theology dealing with the defense and proof of a religious faith, esp. Christianity.
apologia a formal, often lengthy, explanation and defense of one's actions, beliefs, or motives.
apologist a person who argues in defense or justification of a doctrine, belief, action, or the like, usu. in writing or a speech.
apologize to express regret, as for an error or an offense. [2 definitions]
apologue a short allegorical story usu. containing a moral; fable.
apology an expression of regret, as for an error or offense. [2 definitions]
apomorphine a white crystalline alkaloid made from morphine, used as an expectorant and emetic.
apophthegm variant of apothegm.
apoplectic of, relating to, or predisposed to apoplexy. [3 definitions]
apoplexy the sudden loss of the ability to feel or move, caused by a rupture or obstruction of an artery in the brain; stroke.
apoptosis genetically regulated cell death that occurs as a normal part of growth and development, and which also occurs when a cell becomes damaged.
aport on or toward the left or port side of a vessel.
apostasy abandonment of one's religion, principles, loyalties, or the like.
apostate a person who abandons his or her religious faith, principles, cause, or the like. [2 definitions]
apostatize to become apostate.
a posteriori proceeding from effect to cause or from observed particular instances to a generalization; inductive. (Cf. a priori.) [2 definitions]
apostle (sometimes cap.) one of the twelve disciples of Jesus Christ who were sent forth to spread his teachings. [3 definitions]
Apostles' Creed a profession of faith in Christianity that is popularly attributed to Jesus Christ's apostles and often spoken as part of some worship services.
apostolate the office, duties, mission, or term of activity of an apostle, or, esp., of the pope as head of the Apostolic See in the Roman Catholic Church.
apostolic having to do with Jesus Christ's apostles or their teachings. [2 definitions]
Apostolic See the pope's see or center of authority, believed to have been founded at Rome by Peter.