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quantum

 [kwon´tum] (L.)
an elemental unit of energy; the amount emitted or absorbed at each step when energy is emitted or absorbed by atoms or molecules.

quan·tum

, pl.

quan·ta

(kwahn'tŭm, -tă),
1. A unit of radiant energy (Q) varying according to the frequency (ν) of the radiation.
2. A certain definite amount.
[L. how much]

quan·tum

, pl. quanta (kwahn'tŭm, -tǎ)
1. A unit of radiant energy (ε) varying according to the frequency (ν) of the radiation.
2. A certain definite amount.
[L. how much]

quantum

  1. a quantity or amount.
  2. the minimum quantity in which a neurotransmitter is secreted.
  3. a unit of light.

photon 

The basic unit of radiant energy defined by the equation
E = hν
where h is Planck's constant (6.62 ✕ 10−34 joule ✕ second), ν the frequency of the light and E the energy difference carried away by the emission of a single photon of light. The term photon usually refers to visible light whereas the term quantum refers to other electromagnetic radiations. See quantum theory; wave theory; troland.

quan·tum

, pl. quanta (kwahn'tŭm, -tǎ)
Unit of radiant energy (Q) varying by frequency (ν) of radiation.
[L. how much]
References in periodicals archive ?
3D software development toolkit provider Spatial Corp and Renishaw have released a new version of Renishaw's QuantAM software, the companies said.
PD 25.4, 13 (1200) damus totam nostram salinam quantam nos habiemus in territorio de Lampreana et bolonera, quod nos habemus in flumen que uocitant Ezla ...
Il caso infatti nell'Ars magna di Kircher e sempre e solo un modo indiretto per descrivere l'opera organizzatrice di Dio: "in quantam inspectandis animum admirationem infinitae huiusmodi Dei omnipotentiae, sapientiae, et bonitatis quasi ludentis in orbe terrarum, et maximam se, vel in minimis prodentis spectacula rapiant" (730).
Tenders are invited for Supply of Modules of Quantam X-daq
Berger told F1.net that Ferrari's tyre suppliers Bridgestone had made a quantam leap in terms of per formance which has opened up Schumacher's chances of winning this years title.
Observing Bobby Robson in his dealings with the media yesterday, his amicable manner and obvious determination to help Steve Staunton make the quantam leap from coaching duties at Walsall to management in the Euro 2008 qualifiers shone through.
Come e facile prevedere, il divario tra presente e passato si costruisce tutto a svantaggio del presente e la condizione in cui si trova il testo di Livio diviene presto il segno della natura post-lapsaria del tempo in cui Petrarca si trova a vivere--un'idea sintetizzata nell'apostrofe al centro del passo citato: O quantam etatis nostre maculam!
Nomura today announces the launch of the Nomura Quantam SolCap Europe Fund .
You can also discover the truth behind the myths of aliens, yetis and dragons, you'll be holding your own the next time quantam physics comes up in conversation.
Then we would move on to the body treatments and, to finish, she would give me a session with the Quantam face probes to help lift my jaw, saggy eyes and chin.
Tenders Are Invited For Supply Of Quantam Efficiency Measurement Set Up.
They have nothing to lose but they'll find there's a quantam leap between the first division and the premiership.