I. ˈsau̇n-diŋ adjective
Date: 14th century
1. : resonant , sonorous
2.
a. : pompous
b. : imposing
• sound·ing·ly adverb
II. noun
Date: 15th century
1.
a. : measurement of depth especially with a sounding line
b. : the depth so ascertained
c. plural : a place or part of a body of water where a hand sounding line will reach bottom
2. : measurement of atmospheric conditions at various heights
3. : a probe, test, or sampling of opinion or intention