1. adjective Especially noticeable, remarkable, or impressive. Always used before a noun. The actress delivered a stand-out performance that has been garnering awards and acclaim from every corner of the industry. It's going to be hard to make it as an artist if you don't have a stand-out portfolio ready to show potential clients.

2. noun Someone who is especially noticeable, remarkable, or impressive. Thompson is proving to be a stand-out in the field of neuroscience. It's been an amazing trip so far, but one of the stand-outs has definitely been the sunrise hike to the top of Mount Fuji.