Patch

A Patch can refer to several different things:

A piece of textile/fabric.
A patch (synthesizer) is a sound setting for musical synthesizers.
An electrical cable (patch cord) which can be used to alter the functionality of a piece of electrical equipment, such as a musical modular synthesizers. This can be extended to virtual "patches" in software or electronics.
A transdermal patch (such as a nicotine patch used to quit smoking, or a contraceptive patch used to prevent pregnancy)
A telephone patch is any connection between a phone line and another communications device, whether it be a radio, a tape recorder, a data device (such as a modem), or even another phone line.
In amateur radio, a telephone patch connects transmitters or receivers to the phone line for phone conversations.
An American Kennel Club registered name as well as a popular name to call a pet dog.
Practice of compulsory figures in figure skating.
An insignia used as an identification mark by members of gangs.
A small garden, or a place where specific fruits or vegetables are grown (e.g. pumpkin patch).
In railfan terminology, a locomotive or freight car that has been renumbered without a full repaint.
Used in the 1800s. See Patch (1800s)

Computing

patch (Unix) is the name of a UNIX utility (written by Larry Wall) that applies a script generated by the diff program to a set of files, allowing changes from one file to be automatically applied to another file.
A set of "diffs" (differences) suitable for input to the patch program. Patches are a common way of supplying small updates to pieces of software where the source code is available.
A fix for a software program where the actual binary executable and related files are modified. See Patch (computing)
A 3-D Bézier surface used in computer graphics. A primitive in some 3-D software packages.
The name of an IBM utility to edit binary files (typically on mainframe installations, eg MVS).