Definition of ground-truth in English:

ground-truth

verb

  • with object To confirm or validate directly (information or data derived indirectly), especially (in remote sensing) by direct observation on the ground, rather than by interpretation of remotely obtained data; to make observations of (land, an area, etc.) directly on the ground, especially in order to confirm or validate data obtained indirectly.

Origin

1980s; earliest use found in American Antiquities. From ground truth.

Pronunciation

ground-truth

/ˈɡraʊn(d)truːθ/