This is the 1675th most frequent Portuguese word.
aquecimento
Warming or heating.
Here, 'aquecimento' refers to the process of warming, specifically related to the environmental phenomenon of 'global warming'.
O aquecimento global está causando mudanças climáticas.
Global warming is causing climate changes.
In this case, 'aquecimento' refers to the act of warming up, such as exercises performed prior to physical activity to prepare the body.
Fiz um aquecimento antes do treino para preparar os músculos.
I did a warm-up before the training to prepare the muscles.
This usage relates to 'aquecimento' as a heating process, specifically referring to systems providing warmth to spaces during cold seasons.