The term ’21st-century’ can be rephrased in various ways to convey the same meaning. One possible alternative could be ‘contemporary era’, which refers to the current period of time in the 21st century. Another option could be ‘modern age’, which highlights the advancements and changes that have occurred in society and technology during this time. Additionally, ‘digital age’ or ‘information age’ could be used to emphasize the impact of technology and the internet on our daily lives in the 21st century. Ultimately, the choice of phrasing depends on the context and purpose of the communication.