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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.

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I asked again/parallel on the wp-hackers mailing list. – kaiser Jul 24 '11 at 15:28
The bottom line is... don't use it, as it's not currently supported and term aliasing is neither currently supported either, nor is it fully thought through and has a bunch of nasty pitfalls to boot. Codex updated. – Tom Auger May 22 '13 at 14:37
Answer from @otto on wp.org – Sisir Jan 8 '14 at 11:35
up vote 5 down vote accepted

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.

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