D defs.my
Entry 1 sense Webster, 1913

Tuning

/(tūn"ĭng)/ · Tun·ing · IPA /ˈtuːnɪŋ/
01 a. & n. a. & n. from Tune, v.
  1. 1.
    a. & n. from Tune, v. See: Tune
Phrases & compounds
Tuning fork — a steel instrument consisting of two prongs and a handle, which, being struck, gives a certain fixed tone. It is used for tuning instruments, or for ascertaining the pitch of tunes.