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semi-centenary
semi-centenary n. 
/ˌsɛmɪsɛnˈtɛn(ə)ri/, /ˌsɛmɪs(ə)nˈtiːn(ə)ri/, /ˌsɛmɪs(ə)nˈtɛn(ə)ri/, /ˌsɛˌmaɪˈsɛn(t)əˌnɛri/, /ˌsɛmiˌsɛnˈtɛnəri/, /ˌsɛmiˈsɛn(t)əˌnɛri/ the fiftieth anniversary.
Brit. /ˌsɛmɪsɛnˈtiːn(ə)ri/
, /ˌsɛmɪsɛnˈtiːn(ə)ri//ˌsɛmɪsɛnˈtɛn(ə)ri//ˌsɛmɪs(ə)nˈtiːn(ə)ri//ˌsɛmɪs(ə)nˈtɛn(ə)ri/U.S. /ˌsɛˌmaɪˌsɛnˈtɛnəri/
, /ˌsɛˌmaɪˌsɛnˈtɛnəri//ˌsɛˌmaɪˈsɛn(t)əˌnɛri//ˌsɛmiˌsɛnˈtɛnəri//ˌsɛmiˈsɛn(t)əˌnɛri/ΘΚΠ
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
1870 R. Anderson Hist. Missions Amer. Board II. xxvii. 235 The semi-centenary of the mission.
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