portable (Adjective) — Easily or conveniently transported. ex. "a portable television set"
portable (Adjective) — Of a motor designed to be attached to the outside of a boat's hull. ex. "a portable outboard motor"
portable (Adjective) — (computing, of software) able to run or be compiled on various different hardware or operating systems.
portable (Noun) — A small light typewriter; usually with a case in which it can be carried.
portable (Noun) — Something that is portable.