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recurrence at regular intervals of time.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


Tendency to recur at regular intervals.
Farlex Partner Medical Dictionary © Farlex 2012


Tendency to recurrence at regular intervals.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


1. Recurring at intervals or in cycles.
2. Of DNA, the number of base pairs in one complete turn of the double helix. The periodicity of DNA is about 10.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005


  1. the carrying out of certain functions on a regular basis.
  2. the interval between two peaks of activity in a cyclic process.
  3. the number of base pairs per turn of the double helix in DNA.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005


Tendency to recur at regular intervals.
Medical Dictionary for the Dental Professions © Farlex 2012

Patient discussion about periodicity

Q. i just have my period last november 25 and ended on 28.when is my possible fertile and ovulation period please help me identify my fertile and ovulation period

A. If someone knew it, it'd solve the human race many problems with fertility. The problem is that ovulation (and thus, the period of possible fertility) happens 14 days BEFORE the onset of menses, so you know about it only retrospectively.

However there ways such as serial body temperature measuring, along with kits that measures the level of hormones in the urine in order to estimate the time of the coming ovulation, and help in timing intercourse.

You may read more about it here ( ) but anyway, consulting a doctor (e.g. gynecologist) may be wise.

Q. can you get pregnant on your period? i know that you get pregnant when you ovulate and you ovulate in the middle of your menstration cycle, but people have told me that you can get pregnant on your period. can somebody help me out???

A. It's possible, if your menses are long enough and your period is short enough, since semen can survive (and fertilize the ova) up to 3 days after intercourse. It's not common, but also not impossible. That's why the safe-days method isn't very effective in preventing pregnancy.

Q. how should i support my wife during this tough period?

A. first of all don't call it a tough period. a happy period might work better. although the wife can get annoyed by it. but she'll get annoyed from anything... just try to make her comfortable. foot massage , bubble baths, movies and popcorn.
it really depends on what kind of person is she and what she likes or not.


More discussions about periodicity
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References in periodicals archive ?
To the best of our knowledge, this is the first piece of work where the periodicity and the burst trend of query popularity are combined for the task of QAC.
This approach allows us to detect latent periodicity that is the periodicity, which accumulated more than 1.0 base substitution and a number of the bases deletions or insertions within each study period.
The 4th edition of Bright Futures will include another freshly updated periodicity schedule that likely will include maternal depression screening and a recommendation for developmental screening at 4 years, as well as an expanded window for HIV testing from the current 16-18 years to 15-21 years, said Dr.
Feeding periodicity for each 4 h interval was expressed as the wet weight of the full anterior one-third of the stomach divided by the wet weight of the fish.
It can be seen that the zero degree reflection frequency shifted downward with the increasing periodicity. The 10 mm periodicity AMC had a resonant frequency of 432 MHz, doubling the periodicity gave a 4.2% shift in resonant frequency (414 MHz), and again to 40 mm, the resonant frequency dropped to 386 MHz, a reduction of approximately 6.8%.
Mistuning and Change of the Track Periodicity. The passing bands occurring in the track with classic sleepers in the ballast or in slab track are related to the rotation of rails in the classic fastening system.
The region in the parameter space related to the existence and stability of a cycle with symbolic sequence [sigma] is denoted by [P.sub.[sigma]] and called periodicity region.
But frankly, I don't think it is the right business sector for us in terms of the global scale and periodicity of refresh.
Students learn about the periodicity of the trigonometric functions--sine, cosine, tangent and cotangent, after they study the subject of extension of the trigonometric circle and the graphical representation of these functions.
2003) and in (Pritykin, 2006) it was proven that finite automata preserve almost periodicity, i.e.
The company claims that the Sunvalley patented solar cell is less affected by the spectral wavelength, angle and/or polarisation of the incident light because of an array of nanostructures with space varying periodicity and orientation.