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tried and true
triene
triennia
triennial
triennium
Trier
trier
trierarch
trierarchy
Trieste
Trieste, Gulf of
trifecta
triffid
trifid
trifle
trifle with
trifling
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trierarchy

tri·er·ar·chy [ tr ə rrkee ] (plural tri·er·ar·chies)


noun 
Definition:
 
1. system for supporting ancient Greek navy: in ancient Greece, the system that required citizens to subsidize triremes

2. office of trierarch: the authority, office, or position of a trierarch

3. trierarchs: trierarchs as a group

[Mid-19th century. < Greek triērarkhia< triērarkhos "trireme commander"]
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