American Heritage Dictionary
(1)
Century Dictionary
GNU Webster's 1913
WordNet
(1)
Elsewhere on the web
Like the mockingbird, Moorer may be best known for her expressive voice, which comes into play as she covers selections from a wide range of singer-songwriters.— Boise Weekly
Mocking people helps nothing and repeating their stupidity is pure 'mockingbird' regardless of your justifications.— Alex Jones' Prison Planet.com

American Heritage Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about twice a year.