This is the 8580th most frequent Japanese word.
推定
Estimation or presumption.
推定 is used to indicate an estimation or approximate calculation of someone's age based on observation.
彼の年齢は推定で50歳程度だ。
His age is estimated to be around 50 years.
Here, 推定 is utilized to infer or deduce the age of a fossil based on scientific methods.
この化石は推定2000年前のものだ。
This fossil is estimated to be from 2000 years ago.
In this sentence, 推定 refers to the assumption or inference made about the suspect based on available information.