The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount of expense for allocation of cost of intangible asset over its useful life directly used in production of good and rendering of service.

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No definition available.