考证

kǎo zhèngkaozheng

to do textual research
to make textual criticism
to verify by means of research (esp. historical details)
to take an exam to get a certificate (abbr. for 考取證件|考取证件[kao3 qu3 zheng4 jian4])

Characters in this word

Data from JMdict, KANJIDIC2 (EDRDG), KanjiVG, CC-CEDICT and Make Me a Hanzi. Sources and licences