roitlgen

One definition of "first" is "preceding all others" [0], so something with an index of 0 would still be the first item.

Apparently the definition of "zeroth" is "being numbered 0 in a series" [1], so something with an index of 0 could be both the "first" and the "zeroth" item...

However, another definition of "first" is "one that is number one in a series", so the headline of this post is both accurate and inaccurate, depending on which definition you want to use, I suppose.

0: https://www.merriam-webster.com/dictionary/first

1: https://www.merriam-webster.com/dictionary/zeroth