silver jubilee

noun 0.744

half-century

noun 0.717

jubilee

noun 0.675

fiftieth

noun 0.674

fifty-first

noun 0.596

silver anniversary

noun 0.581

five-hundredth

noun 0.570

golden

noun 0.549

quincentenary

noun 0.547

golden number

noun 0.547

fifty-fifty

noun 0.526

fiftysomething

noun 0.522

fifty-sixth

noun 0.519

golden oldie

noun 0.518

fifty-eighth

noun 0.517

centenary

noun 0.516

fifty-ninth

noun 0.516

quinquennial

noun 0.511

old gold

noun 0.509

centennial

noun 0.503