The word aptly describes an action that's done appropriately or fittingly. An audience's standing ovation might aptly capture its enthusiasm for a rock band's energetic performance.
First used in the mid-14th century, the adverb aptly, by way of the adjective apt, "appropriate or suitable," comes from the Latin word aptus, meaning "fit or suited." A dog called Snoozy who lies around on the couch all day is aptly named, and a newspaper obituary that perfectly sums up your grandfather's life aptly captures who he really was. In both examples, something is utterly suited or appropriate.