interrogation

noun

1. (countable, uncountable)The act of interrogating or questioning; an examination by questions; an inquiry.

   “There is no interrogation in his eyes / Or in the hands, quiet over the horse's neck, / And the eyes watchful, waiting, perceiving, indifferent.”

   “As an isolating language Belter Creole is rich in particles. Particles are used to indicate both negation and interrogation: na is the negative particle and it is placed before the verb”

2. (countable, uncountable)A question put; an inquiry.
3. (countable, dated, uncountable)A question mark.