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1.
A game or program that is avaiable for free but offers extra premium features for money.
Free Realms is a Freemium game.
You can play it for free, but its VERY limited for non-paying players
by FRSucks August 18, 2009
 
2.
1. Free or relatively cheap games available for download on Facebook or at the App Store. They tend to have very limited game play and in order to progress you must purchase "premium" content.

2. The Apocalypse
"Sorry children, we won't be having dinner tonight because I spent all of our money on Smurf Berries in one of those new freemium games."
by Bing Google January 22, 2011
 
3.
1. Free or relatively cheap games available for download on Facebook or at the App Store. They tend to have very limited game play and in order to progress you must purchase "premium" content.

2. The Apocalypse
"Sorry children, we won't be having dinner tonight because I spent all of our money on Smurf Berries in one of those new freemium games."
by Bing Google January 22, 2011
 
4.
Something that is "freemium" is a premium or professional product that is offered for free. This can also be a service, such as a car wash.
Their website is offering a "freemium" blog theme as a promotion this weekend, which is great as they typically charge $20 for premium themes.
by MC Thermos April 14, 2009