Definitions
from The American Heritage® Dictionary of the English Language, 4th Edition
 n. The property or condition of occurring at frequent intervals.
 n. Mathematics & Physics The number of times a specified periodic phenomenon occurs within a specified interval, as:
 n. Mathematics & Physics The number of repetitions of a complete sequence of values of a periodic function per unit variation of an independent variable.
 n. Mathematics & Physics The number of complete cycles of a periodic process occurring per unit time.
 n. Mathematics & Physics The number of repetitions per unit time of a complete waveform, as of an electric current.
 n. Statistics The number of measurements in an interval of a frequency distribution.
 n. Statistics The ratio of the number of times an event occurs in a series of trials of a chance experiment to the number of trials of the experiment performed.
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. The rate of occurrence of anything; the relationship between incidence and time period.
 n. The property of occurring often rather than infrequently.
 n. The quotient of the number of times a periodic phenomenon occurs over the time in which it occurs: .
 n. number of times an event occurred in an experiment (absolute frequency)
from the GNU version of the Collaborative International Dictionary of English
 n. The condition of returning frequently; occurrence often repeated; common occurence
 n. A crowd; a throng.
from The Century Dictionary and Cyclopedia
 n. A crowd; a throng.
 n. The quality of being frequent; often occurrence; the happening often in the ordinary course of things.
 n. The ratio of the number of times that an event occurs in the ordinary course of events to the number of occasions on which it might occur; with a few recent writers on physics, the number of regularly recurring events of any given kind in a given time.
 n.
 n. In electricity, see alternating.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 n. the number of occurrences within a given time period
 n. the number of observations in a given statistical category
 n. the ratio of the number of observations in a statistical category to the total number of observations
Etymologies
Examples

We kid about the frequency of Jerome's missives due to .... well, the ** frequency** of his letters. "max stanfield wrote on Apr 23, 2009 11: 09 AM:

As we will discuss in Part IV of this book, the word “Spirit” is used generically here and can be likened to the word frequency in physics—it conceptually refers to a wide spectrum of possible spiritual frequencies of energy that potentially can have an effect in the world.

An even better approach the one used by search engines is to take the term frequency and multiply it by something that captures the rarity of a word.

What i have done in my master thesis was the term frequency of categories words for a thread in a mailing list.

Light of a certain frequency is absorbed and this gives a colour to the crystal or solution.

That fit with nothing we know about sound on Earth, where the frequency is always related to the size and structure of the vibrating substance, of course.

Not even the downconversion sounds like a serious problem, though the frequency is a bit up there … oakling Says:

This frequency is also used by many other wireless devices, and allocating more spectrum to WiFi devices would be one way to avoid interference as the popularity of other 2. 4GHz wireless devices grows, the senators said.

Plus, in addition to the game data, the tracker also used open APIs, such as Amazon S3 for storage and a term frequency API for Facebook.

Is there literature about a cause/effect relationship between criminalizing obscenity and deterrence/reduction in frequency?
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