The true meaning of SERVICE

At one time in my life, I thought I had a handle on the meaning of the word "service."
"It's the act of doing things for other people."
Then I heard these terms which reference the word SERVICE:
Internal Revenue Service
Postal Service
Telephone Service
Civil Service
City & County Public Service
Customer Service
Service Stations
Then I became confused about the word "service." This is not what I thought "service" meant.
So today, I overheard two farmers talking, and one of them said he had hired a bull to "service" a few of his cows. BAM! It all came into perspective. Now I understand what all those "service" agencies are doing to us.
I hope you now are as enlightened as I am.