The quality of being equally excellent or of the same degree of excellence as something else.
From Latin 'aequi-' (equal) combined with 'excellency' (the state of being excellent), derived from 'excellens' meaning outstanding. The term emerged in philosophical discourse to describe comparative states of perfection.
This word appears almost nowhere in modern English, making it a ghost word—a term that was theoretically logical to create but never quite caught on in actual use. It shows how English speakers prefer saying 'equally excellent' rather than inventing new words, even when the building blocks are right there.
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