For example, a pitching moment is a vertical force applied at a distance forward or aft from the center of gravity of the aircraft, causing the aircraft to pitch up or down. Roll, pitch and yaw refer, in this context, to rotations about the respective axes starting from a defined equilibrium state. The equilibrium roll angle is known as wings level or zero bank angle, equivalent to a level heeling angle on a ship.
Definition. There are two types of modifiers in the English language: the adjective and the adverb. They have distinctly different roles, and we will examine each, in turn. First, let's look at the definition of each word. An adjective describes, or modifies a noun--a person, place, thing, or idea.
Definition of modifier. 1  1 : one that modifies. 2  2 : a word or phrase that makes specific the meaning of another word or phrase. 3  3 : a gene that modifies the effect of another.