American Heritage Dictionary
(3)
Century Dictionary
(2)
GNU Webster's 1913
(1)
WordNet
(4)
Elsewhere on the web
A cross-sectional (almost retrospective actually) observational self-report study with a sample size of 219 which fails to control for more than the smallest handful of confounders does not allow much in the way of conclusions.— Planet Atheism
Trunk cross-sectional areas (TCA), canopy dimension and volume, and light interception were measured.— CiteULike: Everyone's library
On the macroscopic scale, the ability to carry current, called conductance, varies linearly as a function of the length and cross-sectional area of the wire.
Although these studies consistently show an association between arsenic exposure and diabetes mellitus, the weak study designs of cross-sectional or case-control, the use of glucosuria or diabetes death as diagnostic criteria and the lack of adjustment for possible confounders in some studies, are major limitations that may reduce the strength of the evidence.— CiteULike: Everyone's library
In this paper, improvements to this method are described, and also an extension of SIENA to a new method for cross-sectional (single time point) analysis.— CiteULike: Everyone's library

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 month.
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