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1. A transient air pressure, such as the shock wave from an explosion, that is greater than the surrounding atmospheric pressure.
2. Geology Pore or subsurface pressure that exceeds normal hydrostatic pressure at a given depth.
tr.v. o·ver·pres·sured, o·ver·pres·sur·ing, o·ver·pres·sures
To cause or subject to overpressure.
o′ver·pres′sur·i·za′tion (-ĭ-zā′shən) n.
(Military) the blast effect of a nuclear weapon expressed as an amount of pressure greater than normal barometric pressure
The pressure resulting from the blast wave of an explosion. It is referred to as "positive" when it exceeds atmospheric pressure and "negative" during the passage of the wave when resulting pressures are less than atmospheric pressure.