In a manner that opposes or rejects formal ceremonies; with simplicity and informality rather than ritual.
Anticeremonial + -ly (adverbial suffix). The -ly ending converts the adjective to an adverb expressing how an action is performed. This word allows description of ceremonial rejection in action or manner.
When a bride and groom exchange vows in jeans at a backyard wedding 'anticeremonially,' they're participating in a tradition that would have shocked their great-great-grandparents—language lets us mark these social revolutions.
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