Words mean things, and many of the most important words mean a range of things. Consider, for example, that love can mean anything from a selfless, divine love to something only barely on the happy side of animal lust. A five year old who declares his love for his mother means something much different from what his mother means when she says she loves him.
A man and woman who discover that they love each other would do well to explore what they mean by love long before they order the wedding invitations. Likewise, we must be careful to define our terms anytime we engage in serious discussion, legislation, or decision-making which turns on the precise meaning of words.