All human beings collectively; the human race; people in general.
From 'human' (from Latin 'humanus,' possibly from 'humus' meaning earth/ground) plus 'kind' (from Old English 'cynd' meaning nature or type). It's a more formal version of 'mankind.'
Interestingly, we use 'humankind' to be more inclusive than 'mankind,' but we invented the distinction only recently—languages constantly update themselves to match what society thinks is fair!
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