trimonthly
adjective
tri·month·ly (ˌ)trī-ˈmən(t)th-lē 
: occurring every three months
Word History
First Known Use
1856, in the meaning defined above
- apprecatory
- appreciable
- appreciably
- appreciate
- appreciated
- appreciated surplus
- appreciates
- appreciating
- appreciation
- appreciations
- appreciative
- appreciatively
- appreciativeness
- appreciativenesses
- appreciator
- appreciators
- appreciatory
- apprehend
- apprehended
- apprehender
- apprehending
- apprehends
- apprehensibilities
- apprehensibility
- apprehensible