What does PASSIVE stand for?

What does PASSIVE mean? We have 3 definitions. Read most used PASSIVE meanings below.

PASSIVE TOURISM. — Leisure travel that emphasizes seeing and observing rather than more active pursuits. Whale watching and theater going are examples of passive tourism.
PASSIVE BOOKING, PASSIVE SEGMENT. — A segment entered in a GDS that does not result in a ticket being issued. Typically used by agents to generate itineraries or make notes.
PASSIVE — (DOD,NATO) In surveillance, an adjective applied to actions or equipments which emit no energy capable of being detected.

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