N2
おおよそ
Approximately, Roughly, About, Outline, Gist
地震による犠牲者はおおよそ120人です。
There are approximately 120 victims as a result of the earthquake.
Explanation
「おおよそ」 has 2 uses
1About (a number)
Before a number, meaning roughly: 「参加者はおおよそ三千人だった」 (about 3,000 people came). Also 「およそ」.
この物件から最寄りの駅までは徒歩でおよそ10分かかります。
It takes approximately 10 minutes to walk to the nearest train station from this property.
地震による犠牲者はおおよそ120人です。
There are approximately 120 victims as a result of the earthquake.
2The general idea
The rough outline of something, not the details: 「おおよその見当がついた」 (I have a rough idea), 「計画のおおよそ」 (the outline of the plan).
まずは計画のおおよそを説明しよう。
To start with, let's roughly explain the plan.
私はおおよそ理解したけど、周りの子達はポカーンとした表情で先生を見ていた。
I understood most of it, but the people around me were looking at the teacher with a blank stare.