BASE jumping

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A type of low-altitude sky diving/extreme sport—invented by Carl Boenish in 1978 in Texas—in which participants jump—with parachute—from 4 types of structures that constitute the acronym, BASE:
• Buildings
• Antennas/Aerials
• Spans (bridges)
• Earth (cliffs)

480 men and women have been awarded an official BASE number. As of April 2009, 133 people have died BASE jumping, with an estimated 1 fatality/60 participants
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

BASE jumping

Sports medicine An extreme sport in which participants jump–with parachute-from 4 types of structures that constitute the acronym: Buildings, Antennas, Spans–bridges, Earth–cliffs
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

BASE jump·ing

(bās jŭmp'ing)
A sport in which participants use a parachute and jump from four types of fixed man-made or natural objects: building or skyscraper, antenna or tower, span (bridge arch or deck), and earth (cliff).
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
Climbing is slow and your focus is on being as close to the face as you can be; basejumping is fast and you need to leap as far away from the wall as you can." Finally breaking his "self-imposed ban" in June 2009, Siegrist scaled and jumped the Eiger Mushroom.
He found a new basejumping mentor in Ueli Gegenschatz, a man known to take safety very seriously and renowned to be meticulous about the preparation of his every jump.
Sponsored by the UO Outdoor Program and Cascadia Wildland Project, the Eugene appearance of the Telluride festival features "Monumental: David Brower's Fight for Wild America," plus short action films of kayaking, rock climbing and basejumping. Tickets are $8 for the general public, $6 for UO students.
The film features extreme skydiving and basejumping and focuses off the biology of risk-taking and the physics of human flight.
Many of about 60 competitors expected to take part in the extreme skydiving - or basejumping - tournament which ends on January 6, leaped off the 1,483ft Petronas Twin Towers in central Kuala Lumpur.