To inquire into or study in order to ascertain facts or information.
To examine, look into, or scrutinize in order to discover something hidden or secret.
To conduct an inquiry or examination.
To demonstrate the feasibility of; to show or be shown to be feasible, accurate, true, satisfactory, as expected, hoped, stated, etc.
To turn out to be feasible, accurate, true, satisfactory, as expected, hoped, stated, etc.