Artificial intelligent assistant

twenty-firster

twenty-firster slang.
  (-ˈfɜːstə(r))
  [f. twenty-first (sc. birthday) + -er6.]
  A twenty-first birthday party (until 1970 in the U.K. celebrating the coming-of-age), or one who celebrates this. Also, a twenty-first birthday present.

1912 Isis 17 Feb. 204/1 There always are, or seem to be, celebrations of a sort on a twenty-firster. 1930 R. Lehmann Note in Music iv. 129 ‘What a lovely case!’ ‘Yes, it was a twenty-firster.’ 1964 C. Mackenzie My Life & Times III. 166 The conventional Twenty-Firster at one of the Oxford hotels or clubs. Ibid. 214 Our rendez-vous with the rest of the Twenty-firsters was for supper. 1975 J. I. M. Stewart Young Pattullo iii. 69 The contraption itself was familiar to me, Ninian once having brought one home from the twenty-firster of an older friend.

Oxford English Dictionary

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