distance between track centers

track skirt (track shield)

track while scan / track-while-scan (TWS)

mean time between critical failure (MTBCF)

mean time between failures (MTBF) (logistics)

mean time between failures requiring overhaul

mean time between significant failures

clearance between barrel and forearm

clearance between the cars

width between eyepieces

difference between the elevation angular limits

blade flapping (the vertical movement in its plane of rotation because of differences in lift between the advancing and retreating blades)

List of Operational Contact Points between Vulcanological Agencies, Meteorological Watch Offices and Air Control Center

mean time between repairs (flying hours)

mean time between repairs in temperate climate

mean time between repairs in tropical climate

between bounds acceleration

correlation between the object linear dimensions and wavelength

AUKUS (ˈɔːkəs) (security partnership between Australia, UK and US)

short circuit between the earphones

buffer distance

distance learning for service personnel

distance measuring equipment

electronic distance measuring equipment (EDME)

endurance distance

horizon distance

known-distance (KD)

landing distance

lateral distance

quantity-distance principle

security distance

short distance navigational aid

slope distance