This is the 11225th most frequent Portuguese word.
matricular
"Matricular" means "to enroll" or "to register."
Here, 'matricular' is used reflexively (me matricular), indicating that the subject is enrolling themselves into a course.
Eu decidi me matricular no curso de culinária.
I decided to enroll in the cooking course.
In this sentence, 'matricular' is used transitively to mean registering another person (your child) in an institution.
Você precisa matricular seu filho na escola antes do prazo final.
You need to enroll your child in school before the deadline.
'Matricular' is again reflexive in this sentence (se matricular), indicating that they are undertaking the action of enrolling themselves.