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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 periodicals archive ?
The initial implant stability was measured using the resonance frequence analysis (RFA) (Ostell Mentor, Integration Diagnostics AB, Goteborg, Sweden).
Contrairement aux projets precedents, dans le cadre de la serie de voyages oo je me servais de mes antennes, de mes radios et de mes ordinateurs pour capter les multiples frequences presentes dans le lieu, a Venise, je m'interessais plus particulierement aux hautes frequences, celles qui sont utilisees par les multiples objets communicationnels; donc, le Bluetooth, le WiFi, les communications par la voix ou au moyen de SMS.
Petite remarque sur l'affichage des resultats : premierement, les six graphiques sont presentes ici au moyen d'un axe << y >> variable pour montrer la frequence d'apparition d'un sujet au cours d'une seance au Parlement.
Total number of seedlings, density, frequence and Importance Value Index (IVI) are showed for the greenhouse treatments Gh-N Total Density Frequence IVI seedlings (indiv/ (%) [m.
Dans plusieurs etudes, il est aussi observe que la frequence des interventions de gestion educative chez les directions, selon l'evaluation des enseignants, tend a varier, entre autres, en fonction du genre, de l'experience et de la formation (Hallinger, 2008; Hallinger & Murphy, 1985; Kruger, Witziers, & Sleegers, 2007).
Ainsi, la frequence moyenne de l'espece vegetale i dans les feces des males et des femelles (Freq-moy) = nombre d'individus (tous sexes confondus) ayant consomme l'espece vegetale sur le nombre d'individus captures (populations des biotopes ou le vegetal i est inventorie) multiplie par 100.
D'apres lui, la mise en relief est produite par une augmentation de l'intensite et de la duree, et par une rupture melodique, alors que l'accent rythmique, qui apparait sur la derniere syllabe de l'unite rythmique, se caracterise par un allongement et une augmentation de l'energie articulatoire, et la frequence fondamentale decrit un glissando montant ou descendant selon le type d'enonce.
Les resultats presentes dans cette etude ont ete discutes a l'aide des figures realisees a partir des traitements informatiques qui regroupent toutes les plantes medicinales en fonction de leur frequence d'utilisation (nombre de fois ou une espece vegetale est utilisee par les 400 personnes interrogees).
Layton selon laquelle la structure des arts rupestres differe profondement, entermes de frequence des motifs et de leur distribution entre les sites, en fonction de la religion et de l'organisation sociale des groupes humains est reexaminee dans ce travail collectif, a l'aide d'une documentation renouvelee et augmentee provenant d'Afrique et d'Australie, mais aussi d'une analyse approfondie de l'art parietal paleolithique d'Europe occidentale.
Beginning in June, the Air France Frequence Plus and KLM Flying Dutchman programs will be merged into a single program, called Flying Blue.
In: Telephonie Mobile--Effets Potentiels sur la Sante des Ondes Electromagnetiques de Haute Frequence (Pietteur Marco, ed).