Definition: Word-of-mom is a viral marketing term used to describe online and face-to-face opinion-sharing between moms, typically involving recommendations of products and services. Used frequently in mommy blogging circles, word-of-mom has become a recent focus of advertisers and marketers, as the 'mommy market' is estimated to be $1.6 trillion. Marketing expert and author Maria Bailey has called word-of-mom "the most powerful marketing tool in existence."

Alternate Spellings: word of mom