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The Collaborative International Dictionary

Lambda \Lamb"da\, n. [NL., fr. Gr. la`mbda.]

  1. The name of the Greek letter [Lambda], [lambda], corresponding with the English letter L, l.

  2. (Anat.) The point of junction of the sagittal and lambdoid sutures of the skull.

  3. (Phys.) A subatomic particle carrying no charge, having a mass equal to 2183 times that of an electron; it decays rapidly, typically forming a nucleon and a pion.

    Lambda moth (Zo["o]l.), a moth so called from a mark on its wings, resembling the Greek letter lambda ([Lambda]).

Douglas Harper's Etymology Dictionary

Greek letter name, from a Semitic source akin to Hebrew lamedh.


n. 1 The eleventh letter of the and alphabet, the twelfth of the alphabet. 2 Unit representation of wavelength. 3 (context physics English) The cosmological constant. 4 (context computing programming English) A lambda expression. 5 (context anatomy English) The junction of the lambdoid and sagittal sutures of the cranium 6 (context physics English) A lambda baryon

  1. n. the 11th letter of the Greek alphabet

  2. the craniometric point at the junction of the sagittal and lamboid sutures of the skull


Lambda (uppercase , lowercase ; lam(b)da) is the 11th letter of the Greek alphabet. In the system of Greek numerals lambda has a value of 30. Lambda is related to the Phoenician letter Lamed . Letters in other alphabets that stemmed from lambda include the Latin L and the Cyrillic letter El (Л, л). The ancient grammarians and dramatists give evidence to the pronunciation as in Classical Greek times. In Modern Greek the name of the letter, Λάμδα, is pronounced ; the spoken letter itself has the sound of "" as with Latinate "L".

In early Greek alphabets, the shape and orientation of lambda varied. Most variants consisted of two straight strokes, one longer than the other, connected at their ends. The angle might be in the upper-left, lower-left ("Western" alphabets), or top ("Eastern" alphabets). Other variants had a vertical line with a horizontal or sloped stroke running to the right. With the general adoption of the Ionic alphabet, Greek settled on an angle at the top; the Romans put the angle at the lower-left.

The HTML 4 character entity references for the Greek capital and small letter lambda are "Λ" and "λ", respectively. The Unicode code points for lambda are U+039B and U+03BB.

Lambda (unit)

Lambda (written λ, in lowercase) is a nonstandard metric unit of volume equal to 10[[cubic meter|m, 1 cubic millimeter (mm) or 1 microlitre (µL). Introduced by the BIPM in 1880, the lambda has been used in chemistry and in medicine for measuring small volumes, but its use is no longer recommended.

This use of λ parallels the pre-SI use of µ on its own for a micrometre and γ for a microgram. Although the use of λ is deprecated, some clinical laboratories continue to use it. The standard abbreviation µL for a microlitre has the disadvantage that it can be misread as mL (a unit 1000 times larger), and in pharmaceutical use no abbreviation for a microlitre is considered safe; recommended practice is to write "microlitre" in full.

Lambda (rocket family)

Lambda is the name of a series of Japanese rockets. It consisted of the types Lambda 2, LS-A, LSC-3, Lambda 3, Lambda 4 and LS-C, developed jointly by Institute of Industrial Science of University of Tokyo, Institute of Space and Astronautical Science of Tokyo University, and Prince Motor Company.

On February 11, 1970 the first Japanese satellite Ōsumi was launched using a Lambda 4 rocket.

The Lambda series are not guided rockets, this is because guidance techniques can often be diverted to military affairs.

The Lambda 4 was launched nine times, though five were failures. The first launch of the Lambda 4S rocket took place on September 26, 1966 from Kagoshima. A fourth-stage attitude control failed resulting in loss of the vehicle and payload. The last launch date was September 1, 1974.

Lambda (newspaper)

Lambda is the official English student newspaper at Laurentian University in Sudbury, Ontario, Canada. It is directly funded from the student fees paid to the Student General Association (SGA), Laurentian University's full-time student union, although the newspaper's charter explicitly prevents the SGA from exerting editorial control of any kind over it.

Lambda is distributed bi-weekly on Tuesdays and is available around the Laurentian University campus, as well as partner distributors throughout the city.

The Lambda offices currently reside on the third floor of the Parker building.

Lambda (association)

Lambda is an association for gay people in Odense, Denmark, founded 1993-09-11. The community wants to strengthen the identities of gays and lesbians, and work with other gay communities for gay rights.

Lambda (anatomy)

The occipital angle is rounded and corresponds with the point of meeting of the sagittal and the lambdoid suture—a point which is termed the lambda (after the Greek letter of the same name whose lowercase form resembles the junction formed by the sutures); in the fetus this part of the skull is membranous, and is called the posterior fontanelle.

Lambda (disambiguation)

Lambda is the eleventh letter of the Greek alphabet that is λ, and capital form Λ.

Lambda may also refer to:

Lambda (olive oil)

Lambda (stylized λ /lambda/) is an award winning Greek luxury olive oil brand, produced by Speiron company, founded in 2007 by Greek entrepreneur Giorgos Kolliopoulos. It has been called the first luxury olive oil in the world. Its brand name originates from the Greek word λάδι (ladi) which means oil in Greek.

Usage examples of "lambda".

Ackbar piloted the Lambda shuttle directly into the forest of girders, Lemelisk looked around, seeing bright flashes of laser welders and the glowing ends of newly smelted durasteel plates that emerged from processing plants.

Five minutes after Admiral Chapman Jirom left his office, Gren began a meeting with another two officials, but then over his intercom speaker his secretary announced the arrival of Lieutenant Lambda Ral of the Secret Service.

When Lambda Ral finished his sentence, he coughed softly and looked up at Gren.

Gren, for his part, was still reeling from the unexpected news, but at the same time he did not want Lambda to take too much of the blame for this on himself.

It was such an out-of-the-blue question that Lambda at first had no idea what his superior was talking about.

You and the Secret Service, Lambda, are going to become pretty busy in the next few days.

And, equally important, is Lieutenant Lambda Ral informed of your assignment?

Gren was fanatical about secrecy, but from what Claret had said, Lambda Ral obviously blabbed far too much.

At first Lambda had thought that Gren was simply planning to assassinate Sha Aznable, and he had been prepared to carry out such an order if necessary.

To find out what was really going on, two nights earlier Lambda had decided to contact an old comrade of his who worked as an S.

The friend with whom Lambda had spoken, moreover, had been equally candid.

Now, Lambda thought, perhaps the Fates were presenting him with an opportunity.

Before Lambda Ral finished his sentence, an enormous flare of light burst out of the end of the distant cylinder.

Nonetheless, despite a five-layer window with built-in filters, Lambda and his men were overwhelmed by the intensity of light.

At five minutes to four, Professor Planish was at Lambda Lambda Lambda House, slightly nervous, to call upon Dr.