[count] 1 plural mediums : something that is sold in a medium size : something that is the middle size when compared with things that are larger and smaller
▪ I take a medium. ▪ These shirts are all mediums and I take a large. ▪ Make my French fries a medium. 2 plural usually media : a particular form or system of communication (such as newspapers, radio, or television)
▪ an effective advertising medium = an effective medium for advertising — see also media 3 : the materials or methods used by an artist
▪ Her preferred medium is sculpture. ▪ The artist works in two media/mediums, pencil and watercolor. 4 : the thing by which or through which something is done
▪ Money is a medium [=means] of exchange. ▪ English is an important medium of international communication. 5 plural mediums : a person who claims to be able to communicate with the spirits of dead people
▪ She visited a medium to try to talk to her dead son. 6 formal : a surrounding condition or environment
▪ Ocean fish live in a medium of salt water.