Here's how it evolved:
* "Secundus" was used to describe the second of two things, much like we might use "second place" today.
* Over time, it began to be used in reference to the second division of time, the one that followed the "first" division, the minute.
* This meaning was established in the 14th century and continues to be the most common usage of the word "second" today.
Interestingly, the term "second" also has a connection to the Roman numeral II. The concept of "second" as a position in a sequence is deeply rooted in the idea of succession. The Roman numeral II represents the second position in a series, reinforcing the idea of "coming after" or "following."
So, the word "second" reminds us that time, like many other things, moves forward in a sequence, with each unit following the one before it.