jar (noun)

a vessel (usually cylindrical) with a wide mouth and without handles

jar, jarful (noun)

the quantity contained in a jar

"he drank a jar of beer"

jolt, jar, jounce, shock (verb)

a sudden jarring impact

"the door closed with a jolt"; "all the jars and jolts were smoothed out by the shock absorbers"

clash, jar, collide (verb)

be incompatible; be or come into conflict

"These colors clash"

jolt, jar (verb)

move or cause to move with a sudden jerky motion

jar, shake up, bump around (verb)

shock physically

"Georgia was shaken up in the Tech game"

jar (verb)

affect in a disagreeable way

"This play jarred the audience"

jar (verb)

place in a cylindrical vessel

"jar the jam"

JAR

In software, JAR is an archive file format typically used to aggregate many Java class files and associated metadata and resources into one file to distribute application software or libraries on the Java platform. JAR files are built on the ZIP file format and have the .jar file extension. Computer users can create or extract JAR files using the jar command that comes with a JDK. They can also use zip tools to do so; however, the order of entries in the zip file headers is important when compressing, as the manifest often needs to be first. Inside jar, file names are unicode text.

Jar

A jar is a rigid, cylindrical or slightly conical container, typically made of glass, ceramic, or plastic, with a wide mouth or opening that can be closed with a lid, screw cap, lug cap, cork stopper, roll-on cap, crimp-on cap, press-on cap, plastic shrink, heat sealed lidding film, an inner seal, a tamper-evident band, or other suitable means.