Fetching details from the dictionary...

a little less than; a little under; slightly fewer than
weakness; the weak; low (setting)
-lower (seismic intensity)
一時間弱で目的地に到着する予定です。
We are scheduled to arrive at our destination in just under an hour.
会場には二百人弱の参加者が集まった。
A little under 200 participants gathered at the venue.
今月の売上は百万円弱にとどまった。
This month's sales stayed at just under one million yen.