Fertile by means of its own pollen. This makes it theoretically possible for both pollen and ovules to unite (with the help of pollinators such as bees) and produce fruit without a second tree being present. Found on https://www.arborday.org/trees/treeguide/glossary.cfm
A plant that is able to pollinate itself and so will produce fruit without the help of another similar plants in its environs. Bi-sexual plants have male and female flowers on the same plant and can thus be self-fertile. Found on https://www.weasdale.com/Glossary-of-Terms