What does adsense mean?

If you try to find it at google about what is adsense. You will get definition about adsense like this

Definitions of adsense on the Web:

Adsense is the name of Google.com’s contextual advertising program.
www.corporatewebsitemarketing.com/search-engine-marketing-glossary.html

Google AdSense is a program that allows Website owners to maximize their page content in terms of SEO relevancy. ...
www.dottraffic.com/glossary/

Google’s marketing program which allows website owners to generate income from displaying relevant Google ads on their websites. AdSense matches the content of the website to ads within their AdWords program and displays the relevant ads on the website. ...
www.firstclicksearch.com.au/search-engine-glossary.aspx

A Google program for site and blog owners to generate income from their business or personal web site or blog. It consists in placing contextual Adwords ads on one’s site and share revenue with Google.
If you try to find it at google about what is adsense. You will get definition about adsense like this

Definitions of adsense on the Web:

Adsense is the name of Google.com’s contextual advertising program.
www.corporatewebsitemarketing.com/search-engine-marketing-glossary.html

Google AdSense is a program that allows Website owners to maximize their page content in terms of SEO relevancy. ...
www.dottraffic.com/glossary/

Google’s marketing program which allows website owners to generate income from displaying relevant Google ads on their websites. AdSense matches the content of the website to ads within their AdWords program and displays the relevant ads on the website. ...
www.firstclicksearch.com.au/search-engine-glossary.aspx

A Google program for site and blog owners to generate income from their business or personal web site or blog. It consists in placing contextual Adwords ads on one’s site and share revenue with Google.
blog.superzu.com/seo-glossary/

Google's contextual advertising program whereby different ads are displayed on your site depending on the content of a particular page on your site. Google pay the site owner a small amount per click through.
www.denialdesign.com/glossary.asp

An advertising program operated by Google whereby the ads displayed on a content site are automatically generated to match the content and revenue is shared with the site owner on a pay per click basis.
www.longtermcarehome.org/glossary.htm

AdSense is an ad serving program run by Google. Website owners can enroll in this program to enable text, image and, more recently, video advertisements on their sites. These ads are administered by Google and generate revenue on either a per-click or per-thousand-impressions basis. ...
en.wikipedia.org/wiki/AdSense

Everybody knows what is adsense, but what is adsense mean? I start to think and try to find out what is adsense since someone send comment to my blog and he said that
"you are using nonsense for adsense"

I feel that there is some connection between that 2 senses. There is two words on Adsense, advertising (ad: a public promotion of some product or service) and sense(To perceive and recognize the meaning of) so for me.. adsense is to perceive and recognize the meaning of advertising.
From there I got an answer why some of my website or blog doesn't earn some money, because I posting about nonsense, I put adsense on nonsense blog and web, and trying to make some money from nonsense..

I hope it's not another bad content for me. I already got 2 vote for bad content at my personal blog.