The Hebrew word שנה has several meanings. It means "year", "to review / repeat" (as it usage in the term, משנה תורה and it also means "to change". Thus, it is an antagonym.
With Rosh Hashanna approaching, I'm curious if there are any commentaries or writings (ancient or more recent) that discuss these opposite meanings and how they may relate to the concept of Teshuva and how one should behave at the start of the new year.
For example, if one is to supposed to change his behavior, how does he do this by "repeating" it? Or, does the definition of "year" include both the concept of repetition as well as change and in what ways?
Surmisal: Every change involves repeating something from the past. The word "new" has several nuances, but, the main idea behind "new" is that it is something that previously never existed. Perhaps, this is the reason why Rosh Hodesh is not mentioned as part of Rosh Hashanna. "Hodesh" means "new". Perhaps, each month (except Rosh Hashanna), one should be creating something absolutely new. On Rosh Hashanna, we shouldn't create something "new" but, rather, we should change things by refining the past.