sesquicentenaryn.
/ˌsɛskwɪsɛnˈtiːnəri/ A one-hundred-and-fiftieth anniversary; a festival celebrating this; = sesquicentennial n.
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the world > time > particular time > an anniversary > [noun] > specific anniversaries
jubileec1386
quinquagenary1588
centenary1661
millennium1664
secular1706
coming of age1788
centennial1791
tricentenary1846
tercentenary1855
quinquennial1857
ter-millenary1864
sexcentenary1865
semi-centenary1870
bicentenary1872
septcentenary1873
quincentenary1877
sesquicentennial1880
quadricentennial1882
bicentennial1883
quatercentenary1883
tricentennial1883
tercentennial1884
quincentennial1885
octocentenary1888
quadrennial1890
quingentenary1892
octingentenary1893
ruby anniversary1893
semi-jubilee1893
septingentenary1893
millennial1896
millenary1897
quadringenary1905
quingenary1911
bimillenary1961
sesquicentenary1961
quasquicentennial1962
nongenary1966
octocentennial1994
1961 Webster's 3rd New Internat. Dict. Eng. Lang.
1969 New Scientist 20 Nov. 389/1 The Cambridge Philosophical Society has just celebrated its sesquicentenary.
1978 Times 9 Jan. 9/7 This weekend's two ‘Mainly Schubert’ concerts..were of a kind to make one wish that his centenary celebrations, this year is the sesquicentenary of his death, came around more often.
This entry has not yet been fully updated (first published 1986; most recently modified version published online March 2018).
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n.1961