kǎo​zhèng

textual research

考证 (考證) kǎo​zhèng
textual research verb
to verify or investigate facts or historical details through textual criticism and research

Historians have conducted rigorous textual research on the authenticity of this passage.

certification verb
to take an examination in order to obtain a professional certificate or license

He's been busy studying for certificates recently, hoping to get his accounting qualification.

Frequency

Movie subtitles
0.390 per million appears in 0% of films
Written text
5.14 per million

Sources

Definitions
CC-CEDICT