Usage Note
Mensualmente means 'on a monthly basis' and is the adverbial form of the adjective mensual. It is common in financial, contractual, and administrative contexts — se paga mensualmente (it is paid monthly). In everyday speech, the adjective mensual is often preferred with a noun: un pago mensual rather than se paga mensualmente. The adverb is not shortened or apocopated in any variety of Spanish.
Examples
"La empresa factura mensualmente a sus clientes."
Natural Translation
The company bills its clients monthly.

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