1. A basic, straightforward principle or guideline that is easy to understand and apply
The simple rule is to always arrive on time for meetings.
A regra simples é sempre chegar no horário para as reuniões.
2. A fundamental law or regulation without exceptions or complex conditions
The company follows a simple rule: no phones during work hours.
A empresa segue uma regra simples: sem telefones durante o horário de trabalho.
3. In mathematics or logic, an uncomplicated formula or principle
The simple rule for calculating interest is principal times rate times time.
A regra simples para calcular juros é capital vezes taxa vezes tempo.