Uni/ˈjuːni/ Definition 1 of 4Pro Tip 1/3Informal Usage 'Uni' is casual speech, more common among students and younger people. Are you excited to be starting uni next year? Pro Tip 2/3Primarily British 'Uni' is predominantly used in the UK and Australia, less in the USA. Most of my friends are at uni or working now. Pro Tip 3/3Life Phase Refers to the time someone studies at a university, often implying the associated lifestyle. My uni days were some of the best of my life.