vigesimal

noun 0.609

sexagenarian

noun 0.603

sixtieth

noun 0.600

sextic

noun 0.594

decimal system

noun 0.586

duodecimal

noun 0.580

sixty-second

noun 0.579

sextile

noun 0.572

sixtysomething

noun 0.558

hexadecimal

noun 0.557

sixte

noun 0.553

sextuple

noun 0.544

sexto

noun 0.530

sextant

noun 0.530

sixty-fourth

noun 0.511

sixteenth

noun 0.501

sext

noun 0.500

bissextile

noun 0.500