They define the meaning of sacrifice.

To be more accurate they started adding to signs or combine two signs to define the meaning.

The case was nevertheless important in that it helped define the meaning of blockade.

Axiomatic semantics define the meaning of a command in a program by describing its effect on assertions about the program state.

Instead, axioms define the meaning of technical terms or fundamental properties of matter and light, and the stated propositions are demonstrated by means of specific, carefully described experiments.