detriment, disadvantage, or deprivation from failure to keep, have, or get: to bear the loss of a robbery.
something that is lost: The painting was the greatest loss from the robbery.
an amount or number lost: The loss of life increased each day.
the state of being deprived of or of being without something that one has had: the loss of old friends.
death, or the fact of being dead: to mourn the loss of a grandparent.
the accidental or inadvertent losing of something dropped, misplaced, stolen, etc.: to discover the loss of a document.
a losing by defeat; failure to win: the loss of a bet.
failure to make good use of something, as time; waste.
failure to preserve or maintain: loss of engine speed at high altitudes.
destruction or ruin: the loss of a ship by fire.
a thing or a number of related things that are lost or destroyed to some extent: Most buildings in the burned district were a total loss.
Insurance. occurrence of an event, as death or damage of property, for which the insurer makes indemnity under the terms of a policy.
Electricity. a measure of the power lost in a system, as by conversion to heat, expressed as a relation between power input and power output, as the ratio of or difference between the two quantities.
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Loss Definition & Meaning | Dictionary.com