(computing, Java programming language) Initialism of Java archive.

(originally) An earthenware container, either with two or no handles, for holding oil, water, wine, etc., or used for burial.

(transitive) To preserve (food) in a jar.

(countable) A clashing or discordant set of sounds, particularly with a quivering or vibrating quality.

(transitive) To knock, shake, or strike sharply, especially causing a quivering or vibrating movement. / (transitive) To harm or injure by such action. / (transitive, figuratively) To shock or surprise.

(dated) ajar

plural of jarring

As much as a jar will hold

plural of jarful

That jars (clashes or disagrees); incongruous, conflictful.