The act of recording or treating something as an expense; spending money on something.
From 'expense' used as a verb (a back-formation from the noun) plus the present participle suffix '-ing' (Old English origin). The verb form became common in accounting and business contexts.
In accounting, 'expensing' something means recording it as a cost rather than as an asset—it's a technical term that businesses use to describe a crucial decision about how to treat a purchase. This shows how the same word can have very different meanings in specialized fields.
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