What do the seasons mean?

Here are a few snippets from an interesting article by Daven Hiskey.

Winter:

[...] probably comes from the Proto-Indo-European (PIE) *wed, meaning “wet”. Alternatively, it may come from the PIE *wind-, meaning “white”

Spring:

plants springing from the ground [...]

Summer:

[...] a variant of the Proto-Indo-European *sem- meaning “together / one”

Autumn:

[...] it’s thought “autumnus” probably came from an Etruscan word and is possibly related to the Latin “augere” meaning “to increase” [...] and became common in the 16th century, about the same time calling it “fall” popped up as the name for the season.  Before calling the season “autumn” or “fall” in English, it was called “harvest”.

Note 1. Here I'm focusing on word meanings whereas the original article is more wide-ranging and discusses the words' evolution.

Note 2. As discussed in comments this is a brief summary of someone else's work. I don't want to duplicate the entire article here. The only changes from original is the use of bold text to highlight what I think most interesting.