Inverse proportion refers to a relationship between two variables in which one increases as the other decreases. There are several synonyms to this relationship, including negative correlation, reverse relationship, and reciprocal variation. Negative correlation suggests that as one variable increases, the other decreases in a predictable manner. Reverse relationship indicates that the two variables operate in a manner that is opposite to what is normally expected. Reciprocal variation indicates that the two variables increase and decrease in such a way that their product remains constant. These synonyms are useful in explaining and understanding the nature of inverse proportion relationships and their importance in mathematics and the sciences.