Collins Concise English Dictionary © HarperCollins Publishers::

sesquicentennial /ˌsɛskwɪsɛnˈtɛnɪəl/ adj
  1. of or relating to a period of 150 years
  1. a period or cycle of 150 years
  2. a 150th anniversary or its celebration

ˌsesquicenˈtennially adv

'sesquicentennial' also found in these entries:
In the English description:

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