concerning sound

The distribution of items set apart according to a plan or purpose

a response to a message; information about a person's behavior

to bring order and organization to something; in maths: any of the magnitudes that serve to define the position of a point or line by reference to a fixed figure or system of lines.

formed by working together as a group

in a formal manner; officially

a prefix meaning 'half'

the development of a plan, system, or proposal

concerning surgery

something that makes a change.