What term describes an expression that is widely accepted over time by a large audience?

The term that best describes an expression that is widely accepted over time by a large audience is "trend." A trend denotes a general direction in which something is developing or changing, often seen in patterns within society, such as fashion, technology, and consumer behavior. Trends emerge when a particular style, idea, or practice gains widespread popularity and continues to receive acceptance for an extended period.

While tradition refers to customs or practices passed down through generations, it does not necessarily imply current acceptance or popularity. Culture encompasses the beliefs, values, and behaviors shared by a group, but it is a broader concept that goes beyond just expressions. Fashion pertains to styles and trends in clothing and aesthetics that may be temporary and change frequently, rather than an expression that is enduringly accepted. In contrast, a trend signifies a sustained level of acceptance and engagement from a large audience over time, making it the most fitting choice.