  We adopt a new perspective on the tensor product of arbitrary semi-lattices.
Our basic construction exploits a description of semi-lattices in terms of
bi-extensional Chu spaces associated to a target space defined to be the
boolean domain. The comparison between our tensor product and the canonical
tensor product, introduced by G.A. Fraser, is made in the distributive case and
in the general case. Some properties of our tensor products are also given.
