1. Occurring every six months or during every period of six months
   - semestral

See also: periodic, periodical, semester

• fall behind
• fall by the wayside
• fall cankerworm
• fall dandelion
• fall down
• fall equinox
• fall flat
• fall for
• fall from grace
• fall guy
• fall in
• fall in line
• fall in love
• fall into
• fall into place
• Fall of Man
• fall open
• fall over
• fall over backwards
• fall short
• fall short of
• fall through
• fall to pieces
• fall under
• fall upon