Definition of "omni"

As such, it's best to rely on more than one source to make absolutely certain that you're getting enough (and it's not like omnis are getting their B12 from only one source, either).

2011, Claire Askew, Generation V: The Complete Guide to Going, Being, and Staying Vegan as a Teenager, page 67

A plant-muncher starts dating an omni, engages them in thought-provoking conversations about veganism, […]

2014, Ayinde Howell, Zoe Eisenberg, The Lusty Vegan

An 'omni' pub that's 'herbi'-friendly, […]

2018, Serena Lee, Vegan London, page 78