This is the 8699th most frequent Japanese word.
明か
"明か" (あか) means "clarity" or "revealing," often related to making something clear or known.
Here, "明か" is used in the verb form "明かす," which means "to reveal." It denotes the act of disclosing something previously hidden.
その夜、彼は秘密を明かした。
That night, he revealed a secret.
In this usage, "明か" is a root of the term "明かにする," emphasizing the act of making something clear or uncovering its truth.
その問題の答えがついに明かにされた。
The answer to the question was finally made clear.
This demonstrates "明かに," where it functions to describe something becoming clearer, highlighting progression toward understanding.