1. a fundamental or elementary truth or piece of information that serves as a foundation for further understanding or reasoning
One basic fact about photosynthesis is that plants convert sunlight into energy.
Um fato básico sobre fotossíntese é que as plantas convertem a luz solar em energia.
2. an indisputable or self-evident piece of information
It is a basic fact that water boils at 100 degrees Celsius at sea level.
É um fato básico que a água ferve a 100 graus Celsius ao nível do mar.