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I was just reading the Codex regarding get_terms();. What exactly is the parameter 'term_group'?
You can use it in (example): 'order_by' for get_terms();.
Hint: I could be all terms that share the same names, but have different slugs.
The idea of term groups was to have a term with multiple aliases.
This feature doesn't seem to be fully backed and is therefore practically never used.
Required, but never shown