To formally record information, thoroughly search or inspect, or enroll oneself in a system
Encoding Strategies:
linguistic

register
register
+
-ar
verb suffix
Registrar means to register and is a direct cognate of the English word.
registrar
to register, to record
To register or record something officially in a formal system or database.
Registramos tu nacimiento en el ayuntamientoWe registered your birth at the town hall
La enfermera registró los datos del pacienteThe nurse recorded the patient's data
to search, to inspect
To search or inspect something thoroughly, often for security or investigative purposes. When you thoroughly search a space, you're systematically going through and checking everything that needs to be registered or accounted for.
La policía registró la casa buscando pruebasThe police searched the house looking for evidence
Registraron mi maleta en el aeropuertoThey inspected my suitcase at the airport
registrarse
to check in, to sign up, to register oneself
To check in, sign up, or register oneself in a system, event, or service.
Me registré en el hotel ayerI checked in at the hotel yesterday
Nos registramos para el curso de españolWe signed up for the Spanish course