American Heritage Dictionary
(1)
Century Dictionary
(1)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
Housing HUD -- Homelessness prevention & rapid rehousing $712,755; Transit replacement of buses, fare boxes and voice annunciator system $25,675,100; Highways WisDOT Economic Recovery— OnMilwaukee.com
In the first photo below, note the annunciator box on the wall with flags that identify different rooms in the house.

Century 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 once a year.
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