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sesquicentennial

ses·qui·cen·ten·ni·al [ sèskwi sen ténnee əl ] or ses·qui·cen·ten·ar·y [ sèskwi sen ténnəree ]


noun  (plural ses·qui·cen·ten·ni·als) (plural ses·qui·cen·ten·ar·ies)
Definition:
 
1. 150th anniversary: a 150th anniversary or the celebration of one

2. 150 years: a period of 150 years



adjective 
Definition:
 
occurring every 150 years: relating to or happening after a period of 150 years


ses·qui·cen·ten·ni·al·ly adverb
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