Meaning of “impulse” - Learner’s Dictionary

impulse

noun uk us /ˈɪmpʌls/
FEELING [ C ]

a sudden feeling that you must do something, without thinking about the results:

[ usually singular ] Her first impulse was to run away.
on impulse

suddenly and without thinking first:

I tend to act on impulse.
SIGNAL [ C ]

a short signal that carries information through a system, for example an electrical system or the nerves in your body

(Definition of “impulse” from the Cambridge Learner’s Dictionary © Cambridge University Press)