"1 more than sixty-nine; the number which is one more than sixty-nine; a symbol representing this number;" Old English (hund)seofontig, from seofon (see seven) + -tig (see -ty (1)). Similar formation in Old Frisian soventich, Middle Dutch seventich, Old Norse sjau tiger.
seventeen
seventeenth
seventh
seventies
seventieth
seventy
seven-up
seven-year itch
sever
several
severally
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