American Heritage Dictionary
(4)
Century Dictionary
(5)
GNU Webster's 1913
(1)
WordNet
(3)
Elsewhere on the web
We have produced 25-30 quintals of fruit per acre, which is selling at an average price of 20 rupees (approx. half a dollar) per kg.— The News is NowPublic.com - NowPublic.com: The News is Now Public
In the native God's-acre, as in the Communion of the Lord's Table, and in the simple rites which accompanied the burial of the dead in Christ, the heathen saw the one lofty platform of loving self-sacrifice to which the Cross raises all its children Oct.— Life of William Carey
Germany. (From a photograph taken in 1894 The medićval English acre was a long narrow strip forty rods in length and four rods in width, a half-acre or quarter-acre being of the same length, but of two rods or one rod in width.— An Introduction to the Industrial and Social History of England
We have raised about thirty bushels to the acre, which is very well for sod.— The Master-Knot of Human Fate
There are 67 trees on the acre, which is too many for good nut production.— Northern Nut Growers Association, Report Of The Proceedings At The Tenth Annual Meeting. Battle Creek, Michigan, December 9 and 10, 1919

American Heritage Dictionary (1)
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 a few times a week.