American Heritage Dictionary
(6)
Century Dictionary
(5)
GNU Webster's 1913
(1)
WordNet
(3)
Elsewhere on the web
The strongest rumours are afloat, and increase with regard to his leaning towards the Opposition; and certainly these invitations do not discourage them.— Memoirs of the Court of George IV. 1820-1830 (Vol 1) From the Original Family Documents
The purposes and motives of Jesus may be but poorly understood by man; but in this woman's case we see the possibility of stories strange and untrue getting afloat, and it appears to have been the wiser course to make plain the truth then and there.— Jesus the Christ A Study of the Messiah and His Mission According to Holy Scriptures Both Ancient and Modern
Of course the wildest rumours were afloat, the cheaper newspapers had details that had been evolved from the brilliant imagination of creative reporters; a score of them had already besieged the manager of the Royal Palace Hotel and were making his life a burden to him.— The Slave of Silence
He too afloat,--afloat.— The Atlantic Monthly, Volume 17, No. 104, June, 1866

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 twice a week.