1. the absence of oversight, monitoring, or management by someone in authority
The accident was caused by a lack of supervision in the construction site.
O acidente foi causado pela falta de supervisão no canteiro de obras.
2. insufficient monitoring or control of activities, behavior, or processes
A lack of supervision allowed the children to play unsafely.
A falta de supervisão permitiu que as crianças brincassem de forma insegura.