Dictionaryses•qui•cen•ten•ni•alPronunciation: (ses"kwi-sen-ten'ē-ul), [key] —adj. pertaining to or marking the completion of a period of 150 years. —n. a 150th anniversary or its celebration. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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