To attenuate something is to make it weaker or less in amount, effect, or force.

// The switch from the clack of typewriters to the quiet tap of computer keyboards greatly attenuated the noise level of the office.

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“The food sources at sea may well be sometimes subject to human greed, but the puffin colony on the Skelligs is robust, and this natural culling has always been a feature of their lives. Yet here, our lives—the few of us who live here—and those of the birds always overlap. We, too, are utterly insignificant in the grand extent of all things, and we share concerns with the wildlife here. There are interconnections; there is codependence between us, even if it is attenuated—at least in our human minds. And birds keep arriving at our doors.” — Robert L. Harris, Returning Light: Thirty Years on the Island of Skellig Michael, 2023

Attenuate ultimately comes from a combining of the Latin prefix ad-, meaning “to” or “toward,” and tenuis, meaning “thin,” a pedigree that is in keeping with the English word’s current meanings, which all have to do with literal or metaphorical thinning. The word is most common in technical contexts, where it often implies the reduction or weakening of something by physical or chemical means. You can attenuate wire by drawing it through successively smaller holes, for example, or attenuate gold by hammering it into thin sheets. Current evidence dates the term to the 16th century, in which we find many references to bodily humors in need of being attenuated; modern medicine prefers to use the word in reference to procedures that weaken a pathogen or reduce the severity of a disease.