This is the 4821st most frequent Japanese word.
浄
"Pure" or "clean."
"浄" appears in "浄水器," a device for purifying water, indicating its role in purification.
浄水器を使って水をきれいにしました。
I used a water purifier to clean the water.
The word "浄" is used in "浄化" to indicate purification, often metaphorical or spiritual.
彼は心の浄化を求めています。
He is seeking purification of his heart.
"浄" here describes the cleanness or purity of the water, emphasizing its pristine nature.