This is the 2850th most frequent Japanese word.
およそ
Approximately; about.
In this sentence, 'およそ' is used to present an approximate number, emphasizing that the height given is an estimation rather than a precise value.
この山の高さはおよそ千メートルです。
The height of this mountain is approximately one thousand meters.
Here, 'およそ' denotes an approximate time frame, giving an estimate of when he departed without stating the exact time.
彼はおよそ三時間ほど前に家を出ました。
He left the house approximately three hours ago.
'およそ' is used to provide an estimate of the number of participants, indicating that the actual count might slightly differ.