# frequency

(redirected from*observed frequency*)

Also found in: Dictionary, Thesaurus, Legal, Encyclopedia.

Related to observed frequency: expected frequency

## frequency

[fre´kwen-se]**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.

## fre·quen·cy (ν),

(frē'kwen-sē),The number of regular recurrences in a given time, for example, heartbeats, sound vibrations.

[L.

*frequens,*repeated, often, constant]## frequency

/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)

[frē′kwənsē]

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).

## frequency

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.## frequency

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.## fre·quen·cy

**(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]## frequency

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.## Frequency

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

## fre·quen·cy

(frē'kwĕn-sē)The number of regular recurrences in a given time, e.g., heartbeats, sound vibrations.

[L.

*frequens,*repeated, often, constant]## frequency

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**

see ultrasound.

## 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.