From Longman Dictionary of Contemporary Englishsilver anniversaryˌsilver anniˈversary noun [countable] TMCsilver wedding anniversary
Examples from the Corpus
silver anniversary• Ateneo Honeymoon and silver anniversary couples staying 5 nights or more receive dinner on arrival and a complimentary gondola ride.• Gabbiano Honeymoon and silver anniversary couples receive a bottle of sparkling wine and flowers or fruit.• There's a two-hour Twilight Zone special to celebrate its silver anniversary. 