multibillionairen.
/ˌmʌltɪˌbɪljəˈnɛː/, U.S. /ˌməltiˈˌbɪljəˈˌnɛ(ə)r/, /ˌməltaɪˈˌbɪljəˈˌnɛ(ə)r/; see also multi- comb. form. A person with assets worth several or many billions (of pounds, dollars, etc.).
ΘΚΠ
the mind > possession > wealth > [noun] > rich or wealthy person > person who has large amount of money
jingle-boya1640
four-millioneer1667
plum1709
millionary1786
millionaire1795
money bag1820
millionista1843
trimillionaire1848
multimillionaire1858
billionaire1861
millioner1865
trillionaire1873
quadrillionairea1876
thousandaire1896
milliardaire1897
multibillionaire1906
zillionaire1926
multi1950
mega-millionaire1968
squillionaire1979
1906 ‘M. Twain’ in N. Amer. Rev. Sept. 322 There would not be any multi-billionaire alive, perhaps, who would be able to buy a full set.
1990 Sunday Express 14 Jan. (Colour Suppl.) 20 (caption) The former multi-billionaire was eventually granted bail.
This entry has been updated (OED Third Edition, March 2003; most recently modified version published online March 2022).
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n.1906