- The fundamental set of qualities, and the range of behaviour, shared by all humans.
1922, Ben Travers, chapter 5, in A Cuckoo in the Nest:
- The most rapid and most seductive transition in all human nature is that which attends the palliation of a ravenous appetite. There is something humiliating about it. […] Can those harmless but refined fellow-diners be the selfish cads whose gluttony and personal appearance so raised your contemptuous wrath on your arrival?