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1. the number of occurrences of a periodic or recurrent process in a unit of time, such as the number of electrical cycles per second measured in hertz. In cardiac pacing terminology, frequency is expressed by the formula: frequency = ½ × pulse width.
2. the number of occurrences of a particular event or the number of members of a population or statistical sample falling in a particular class.
radio frequency the range of frequencies of electromagnetic radiation between 10 kilohertz and 100 gigahertz, used for radio communication.
relative frequency the ratio of the number of occurrences of a specified phenomenon in a population to the total size of the population.
urinary frequency urination at short intervals without increase in daily volume of urinary output, due to reduced bladder capacity or cystitis.

fre·quen·cy (ν),

The number of regular recurrences in a given time, for example, heartbeats, sound vibrations.
[L. frequens, repeated, often, constant]


/fre·quen·cy/ (fre´kwen-se)
1. the number of occurrences of a periodic process in a unit of time. Symbol ν.
2. in statistics, the number of occurrences of a determinable entity per unit of time or of population. Symbol f.

urinary frequency  urination at short intervals without increase in daily volume or urinary output, due to reduced bladder capacity.

frequency (F)

Etymology: L, frequens, frequent
1 the number of repetitions of any phenomenon within a fixed period, such as the number of heartbeats per minute.
2 (in biometry) the proportion of the number of persons having a discrete characteristic to the total number of persons being studied.
3 (in electronics) the number of cycles of a periodic quantity, such as alternating current, that occur in a period of 1 second. Electromagnetic frequencies, formerly expressed in cycles per second (cps), are now expressed in hertz (Hz).


The number of cycles or repetitions of a periodic wave or signal per unit time. In electromagnetic radiation, frequency is usually expressed in units of hertz (Hz), where 1 Hz = 1 cycle per second.


Statistics The number of times that a particular periodic event occurs in a unit time. See Collision frequency, Cumulative frequency, Larmor frequency, Observed frequency, Order frequency, Pulse repetition, Recombination frequency, Relative frequency.


(ν) (frē'kwĕn-sē)
1. The number of regular recurrences in a given time, e.g., heartbeats, sound vibrations.
2. acoustics the number of cycles of compression and rarefaction of a sound wave that occur in 1 second, expressed in hertz (Hz).
3. The rate of vocal fold vibration (i.e., the number of times the glottis opens and closes in 1 second) during phonation; perceived as voice pitch.
[L. frequens, repeated, often, constant]


An informal term referring to the condition in which urine is passed more often than normal (frequency of urination). Frequency may be due to excessive fluid intake, bladder infection, pregnancy, the use of DIURETIC drugs, or, in men, to an enlarged prostate gland obstructing the urinary outflow so that the bladder can only be partially emptied. Frequency is occasionally of psychological origin.


Sound, whether traveling through air or the human body, produces vibrations—molecules bouncing into each other—as the shock wave travels along. The frequency of a sound is the number of vibrations per second. Within the audible range, frequency means pitch—the higher the frequency, the higher a sound's pitch.
Mentioned in: Abdominal Ultrasound


The number of regular recurrences in a given time, e.g., heartbeats, sound vibrations.
[L. frequens, repeated, often, constant]


n the number of cycles per second of a wave or other periodic phenomenon.
frequency polygon,
n a graphic representation of a frequency distribution constructed by plotting each frequency above the score or midpoint of a class interval laid out on a base line and connecting the points so plotted by a straight line.


1. the number of occurrences of a periodic process in a unit of time.
2. in statistics, the number of occurrences of a determinable entity per unit of time or of population.

cumulative frequency
the graph of its cumulative frequencies.
frequency distribution
see frequency distribution.
expected frequency
the expected number of occurrences.
observed frequency
the actual frequency; as opposed to the expected frequency.
relative frequency
the number of observations of a particular, nominated value expressed usually as a proportion of the total frequency.
total frequency
the total number of observations in the set of data.
ultrasound frequency

Patient discussion about frequency

Q. What foods or liquids, juices, proteins, fruits, are good for Male Prostate or Urinary Frequency? I am 53 YO Male with exessive urinary frequency. Is there a fruit, food, drink, pill, mojo, that would help me with this problem? I am talking about urinating 3 to 4 times every night, and or while watching TV, every hour or so. No pain, yet, an occacional after drip that is very anoying. Perhaps I have a prostate problem and should consuld with my Urologist. Yet, before I go there, does anyone know of something I can eat or drink to fix or aleviate this problem?

A. Thanks for the heads-up. One of my issues is that I LOVE coffee, thus, reducing my daily consumption of 2-3 cups could be a problem.

More discussions about frequency
References in classic literature ?
The means of revenue, which have been so greatly multiplied by the increase of gold and silver and of the arts of industry, and the science of finance, which is the offspring of modern times, concurring with the habits of nations, have produced an entire revolution in the system of war, and have rendered disciplined armies, distinct from the body of the citizens, the inseparable companions of frequent hostility.
is not less a source of frequent and intricate discussions, sufficiently denoting the indeterminate limits by which they are respectively circumscribed.
My brother admires her greatly already; he will have frequent opportunity now of seeing her on the most intimate footing; her relations all wish the connection as much as his own; and a sister's partiality is not misleading me, I think, when I call Charles most capable of engaging any woman's heart.
The strength of the family tie in France, and its comparative weakness in America, has been the subject of frequent comment among travelers.
In speaking of his intelligence, my wife, who at heart was not a little tinctured with superstition, made frequent allusion to the ancient popular notion, which regarded all black cats as witches in disguise.
The natives inhabiting the lower part of the river, and with whom the company was likely to have the most frequent intercourse, were divided at this time into four tribes, the Chinooks, Clatsops, Wahkiacums, and Cathlamahs.
I commend rather some diet for certain seasons, than frequent use of physic, except it be grown into a custom.
The fourth species [1293a] of democracy, the last which was established in order of time, arose when cities were greatly enlarged to what they were at first, and when the public revenue became something considerable; for then the populace, on account of their numbers, were admitted to share in the management of public affairs, for then even the poorest people were at leisure to attend to them, as they received wages for so doing; nay, they were more so than others, as they were not hindered by having anything of their own to mind, as the rich had; for which reason these last very often did not frequent the public assemblies and the courts of justice: thus the supreme power was lodged in the poor, and not in the laws.
From the cloister, his reputation as a learned man had passed to the people, among whom it had changed a little, a frequent occurrence at that time, into reputation as a sorcerer.
As far as Gania was concerned, it might have been supposed that the news had come through Varvara Ardalionovna, who had suddenly become a frequent visitor of the Epanchin girls, greatly to their mother's surprise.
Besides, as a result of the frequent and rapid change of position by each army, even what information was obtained could not be delivered in time.
Ferrari, whose anxiety about her husband made her a frequent, a too frequent, visitor at the lawyer's office.

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