An interpreter is someone who translates something to make it understandable, usually spoken language. When your class takes a trip to Russia, you’ll likely have an interpreter to translate Russian to English so you can understand what people are saying to you.
Need to talk to someone who doesn't speak your language? You'll need an interpreter. Say you're interviewing a Bulgarian diplomat, but you don't speak Bulgarian. The interpreter would listen to a few sentences in Bulgarian and then repeat them in English, and then listen to your English response and repeat that in Bulgarian. We also use interpreter for artists who represent ideas or places in their work. If you paint industrial cityscapes, you're an interpreter of urban life.
Definitions of interpreter
noun
someone who mediates between speakers of different languages
English translator and Protestant martyr; his translation of the Bible into English (which later formed the basis for the King James Version) aroused ecclesiastical opposition; he left England in 1524 and was burned at the stake in Antwerp as a heretic (1494-1536)
a Christian believed to be of Cappadocian descent who became bishop of the Visigoths in 341 and translated the Bible from Greek into Gothic; traditionally held to have invented the Gothic alphabet (311-382)
an interpreter and guide in the Near East; in the Ottoman Empire in the 18th and 19th centuries a translator of European languages for the Turkish and Arab authorities and most dragomans were Greek (many reached high positions in the government)