Русско-англо-русский юридический словарь

Retirement of assets. Retirement is the permanent withdrawal of depreciable property from use in your trade or business or in the production of income. You may do this by selling, exchanging, or abandoning the asset. You may also withdraw the asset from use without disposing of it. For example, you could place it in a supplies or scrap account. (A Selection of ... Internal Revenue Service Tax Information Publications)

Disposal of assets occurs when an organization eliminates an asset from its accounting records. This could be because the organization sold the asset, the asset depreciated or someone stole the asset. Removing all traces of the asset from a balance sheet, which professionals call derecognition, usually requires companies to record the associated gain or loss. (Indeed)

Under Treasury Regulation 1.167(a)-8, the retirement of an asset means "the permanent withdrawal of depreciable property from use in the trade or business or in the production of income." (Boston College Law Review)