D defs.my
Entry 1 sense Webster, 1913

Tenfold

/tĕn'-fōldˌ/ · Ten·fold · IPA /ˈtɛnfoʊld/
01 a. & adv. In tens; consisting of ten in one; ten times repeated.
  1. 1.
    In tens; consisting of ten in one; ten times repeated.
    “The grisly Terror . . . grew tenfold More dreadful and deform.” Milton.