JLPT N2
確
certain, firm, sure
Readings
On'yomiカク
Kun'yomiたし.か
Mnemonic
As solid as a STONE (石), you are CERTAIN (確) of the facts.
Example Words
確か (たしか) for sure, if I remember correctly
確かめる (たしかめる) to check, to make sure
正確 (せいかく) accurate, correct
確認 (かくにん) confirmation