fortnight

noun 0.851

biweekly

noun 0.779

bimonthly

noun 0.744

semiweekly

noun 0.716

semi-weekly

noun 0.714

semimonthly

noun 0.713

triweekly

noun 0.676

biannual

noun 0.645

biennial

noun 0.628

quarterly

noun 0.614

semiannual

noun 0.603

quadrennial

noun 0.603

weekly

noun 0.600

quinzaine

noun 0.595

newsweekly

noun 0.549

nightly

noun 0.547

quadrennium

noun 0.543

midweek

noun 0.541

triennial

noun 0.539

biennium

noun 0.537

every second

noun 0.533

monthly

noun 0.529

periodical

noun 0.527

week

noun 0.522

quarter of an hour

noun 0.515

weekend

noun 0.507