Meaning

noun a periodical that is published every week (or 52 issues per year)

adjective of or occurring every seven days

adverb without missing a week

originFrom Middle English wykely (adverb), equivalent to week + -ly (adverbial suffix) or week + -ly (adjectival suffix). Compare Dutch wekelijks (“weekly”), German wöchentlich (“weekly”), Danish ugentlig (“weekly”), Norwegian ukentlig (“weekly”), Icelandic vikulega (“weekly”), Swedish veckovis (“weekly”).

Etymology from Wiktionary, CC BY-SA 3.0