Definitions from Wiktionary ( )

▸ adjective:  On somebody's back or shoulders.
▸ adjective:  Pertaining to transportation of goods where one transportation unit is carried on the back of something else. For example, a truck on a train.
▸ adjective:  Attached or appended to something larger or more important.
▸ adverb:  On somebody's back or shoulders.
▸ verb:  (transitive) To carry (someone) on the back or shoulders.
▸ verb:  (ambitransitive) To attach or append something to another (usually larger) object or event.
▸ verb:  (transitive, Internet) To obtain a wireless internet connection by bringing one's own computer within the range of another's wireless connection without that subscriber's permission or knowledge.
▸ verb:  (transitive, Internet) To utilize "last-mile" wiring rented from a larger owner ISP by a smaller ISP.
▸ verb:  (transitive) To transport (a lorry/truck) on a flatbed railway wagon.
▸ verb:  (transitive) To enter a secured area at the same time along with (someone having authorized access); to tailgate.
▸ noun:  (countable) A ride on somebody's back or shoulders.
▸ noun:  An act or instance of piggybacking.
▸ noun:  (medicine, countable, uncountable) The connection of one intravenous drip to another.

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