noun On a Karnaugh map: a set of ones (whose quantity is a power of two) which are related by adjacency (i.e., the set is connected, if the Karnaugh map is considered to be a graph which "wraps around" its edges, like a torus; and all elements of the subgraph induced by the set have the same degree). Equivalently, in terms of Boolean algebra, a product term which, when true, always implies that the given Boolean function is true.