Originally Posted by gondorian
When it is being discussed in ENGLISH and not in Latin, the plural of focus is always foci in a mathematical and scientific context. Focuses is also considered correct by Webster, but only n00bs use it. As OpsDad has so kindly pointed out, this does not correlate directly with the pluralization in Latin.
HOWEVER WE DON'T SPEAK LATIN ANYMORE IT IS A DEAD LANGUAGE!
I use it... daily; and in some contexts, exactly BECAUSE it is a dead language, and there is no hiding behind "what the definition of 'is' is..."
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