The word "weekly" is a transparent compound formed within English from its native Germanic elements. Its first element, "week," descends from the Proto-Germanic \wikōn, which likely referred to a sequence or change, possibly linked to the concept of turning, as seen in its Proto-Indo-European root \weik- meaning "to bend, to wind." The suffix "-ly," from Old English -līc, originally meant "body" or "form" (related to "like"), and evolved into a highly productive suffix for forming adjectives meaning "characteristic of" or "recurring at a period of." Therefore, "weekly" literally means "having the character of a week," logically evolving to describe anything pertaining to or occurring once every seven-day cycle.

Structure: week (a period of seven days) + ly (adjective/adverb suffix) - week: From Old English wice, wicu, of Germanic origin, related to Dutch week and German Woche. It functions as the core noun denoting a time period. - ly: From Old English -līc, an adjective-forming suffix meaning "having the qualities of" or "occurring at intervals of". In this word, it creates an adjective/adverb meaning "pertaining to a week".