n.1.The quality or state of being portable; fitness to be carried.
Noun1.portability - the quality of being light enough to be carried
(operating system, programming)portability - The ease with which a piece of software (or file format) can be "ported", i.e. made to run on a new platform and/or compile with a new compiler.

The most important factor is the language in which the software is written and the most portable language is almost certainly C (though see Vaxocentrism for counterexamples). This is true in the sense that C compilers are available for most systems and are often the first compiler provided for a new system. This has led several compiler writers to compile other languages to C code in order to benefit from its portability (as well as the quality of compilers available for it).

The least portable type of language is obviously assembly code since it is specific to one particular (family of) processor(s). It may be possible to translate mechanically from one assembly code (or even machine code) into another but this is not really portability. At the other end of the scale would come interpreted or semi-compiled languages such as LISP or Java which rely on the availability of a portable interpreter or virtual machine written in a lower level language (often C for the reasons outlined above).

The act or result of porting a program is called a "port". E.g. "I've nearly finished the Pentium port of my big bang simulation."

Portability is also an attribute of file formats and depends on their adherence to standards (e.g. ISO 8859) or the availability of the relevant "viewing" software for different platforms (e.g. PDF).
movability, movableness
Translate Portability to German, Translate Portability to French
Port of Spain
Port Orford cedar
Port Sudan
Port toll
Port Vila
Port warden
port watcher
port wine
port-access coronary bypass surgery
port-wine stain
porta hepatis
-- Portability --
Portable AIRTIME
Portable Commodore 64
Portable Common Loops
Portable Common Tool Environment
portable computer
Portable Document Format
Portable forge
Portable Forth Environment
Portable Network Graphics
Portable Operating System Interface
Portable Pixmap
portable saw
Portable Scheme Debugger
Portable Scheme Interpreter
Portable Standard Lisp
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