1a painting, drawing, photograph, or engraving of a person, especially one depicting only the face or head and shoulders:a portrait of George III [as modifier]:a portrait painter
a representation or impression of someone or something in language or on film or television:the writer builds up a fascinating portrait of a community
2 [as modifier] denoting a format of printed matter which is higher than it is wide:you can print landscape and portrait pages in the same documentCompare with landscape (sense 2 of the noun).