This is the 1518th most frequent Portuguese word.
estimular
To encourage, stimulate, or promote activity or interest.
Here, 'estimular' is used to mean 'encourage' or 'motivate' someone to do something, showing a supportive action.
Os professores devem estimular os alunos a estudar.
Teachers should encourage students to study.
In this sentence, 'estimular' refers to 'stimulating' a biological process, indicating a scientific or medical application.
Este remédio pode estimular o crescimento do cabelo.
This medicine might stimulate hair growth.
The word 'estimular' is used metaphorically here, meaning to activate or enhance mental activity.