A2[C or U]a style that is popular at a particular time, especially in clothes, hair, make-up, etc.: Long hair is back in fashion for men.Fur coats have gone out of fashion.a programme with features on sport and fashionShe always wears the latest fashions.There was a fashion for keeping reptiles as pets.FashionModern and fashionableModern and fashionablefollow (a) fashion›to do what is popular at the timeCustom, tradition and conformitylike it's going out of fashioninformal›If you use something like it's going out of fashion, you use large amounts of it very quickly: Emma spends money like it's going out of fashion.Large in number or quantityHurrying and doing things quicklyBusy and active