* Proto-Germanic: The word "summer" originates from the Proto-Germanic word "*sumar*", which likely meant "season of warmth" or "season of the sun."
* Old English: This Proto-Germanic word evolved into "sumor" in Old English, which was the language spoken in England from roughly the 5th to the 12th centuries.
* Middle English: The word further evolved to "somere" during the Middle English period (12th to 15th centuries).
* Modern English: Finally, the word settled into its current form, "summer," in Modern English.
Interesting Fact: The word "summer" is closely related to the word "sun." This makes sense considering the season's association with warmth and sunlight.
Overall, the word "summer" has its roots in the Proto-Germanic language and has evolved over centuries to become the word we use today to describe the warmest season of the year.