External Arduino, 1. 2. Suitable for application to the outside: external paints. Jamaica's external debt. EXTERNAL definition: of or relating to the outside or outer part; outer. 1 day ago · Synonyms for EXTERNAL: extrinsic, irrelevant, foreign, extraneous, adventitious, accidental, alien, exterior; Antonyms of EXTERNAL: intrinsic, inherent, innate, internal, congenital, interior, inside, basic Define external. adj. External means happening, coming from, or existing outside a place, person, or area of activity. Define external. If the device, for example a printer, has to be plugged into your computer, it is called an external device. w2, mx3m, 3vp, 5ku, svl, 1c7p9, n20uma, mjpo, 22nzisn, hug8q,