Jonathan UK /ˈd͡ʒɒnəθən/US /ˈd͡ʒɑnəθən/ noun3 •An apple cultivar from New York.For example, Jonathans are tart and great for baking. — 2018 •(slang, old-fashioned) An American; a Yank; Brother Jonathan. •(slang) penis formsJonathans