All articles A–Z
519,064 articles
Annual publication
Annual publication: a serial work issued once a year, also called an annual or yearbook; covers annual reports, directories, almanacs, and yearly journal volumes, cataloged with MARC frequency code 'a' and eligible for ISSN.
Annual recurring revenue
Annual recurring revenue (ARR) is a company-defined, non-GAAP metric that annualizes a business's recurring subscription revenue at a point in time, most commonly reported by SaaS companies.
Annual report
An annual report is a company's yearly account of its business, required by law in many jurisdictions, such as the SEC's Form 10-K in the United States.
Annual Review of Biochemistry
Annual Review of Biochemistry: Annual Reviews' flagship review journal, founded 1932 by J. Murray Luck at Stanford, publishing commissioned critical reviews in biological chemistry and molecular biology; impact factor 24.9, rank 6 of 328.
Annual Review of Ecology, Evolution, and Systematics
Annual Review of Ecology, Evolution, and Systematics (AREES, ISSN 1543-592X): Annual Reviews' annual invited-review journal, published since 1970, retitled 2003; impact factor 12.9, Q1 in ecology and evolutionary biology.
Annual Review of Phytopathology
Annual Review of Phytopathology (ISSN 0066-4286) is Annual Reviews' annual peer-reviewed plant pathology review journal, published since 1963, founding editors Horsfall and Baker, impact factor 13.2, Volume 64 in 2026.
Annual Reviews (publisher)
Annual Reviews: American nonprofit scholarly publisher founded 1932 by J. Murray Luck, publishing invited review journals across 51 disciplines; pioneered Subscribe to Open, converting all 2023-2025 volumes to open access.
Annuit cœptis
Annuit cœptis is a Latin motto meaning "Providence has favored our undertakings," inscribed above the Eye of Providence on the reverse of the Great Seal of the United States.
Annuity
An annuity is a series of equal payments made at fixed intervals, valued by discounting each payment to the present at a stated interest rate.
Annular atrophic lichen planus
Annular atrophic lichen planus (AALP), a rare lichen planus variant with annular plaques, central atrophy, and elastin fiber loss in the papillary dermis; fewer than 30 cases reported, steroid-resistant, treated with tacrolimus or biologics.
Annular combustor
An annular combustor is a gas turbine combustion chamber shaped as a single continuous ring around the engine shaft, where fuel burns with high-pressure air.
Annular Core Research Reactor
The Annular Core Research Reactor (ACRR) is a pool-type research reactor at Sandia National Laboratories in Albuquerque, operated for the NNSA since 1978 for radiation effects testing.
Annular cutter
An annular cutter, or broach cutter, is a hollow metal-cutting tool used with magnetic drills to cut large holes in steel, removing only a ring of material.
Annular dark-field scanning transmission electron microscopy
Annular dark-field scanning transmission electron microscopy (ADF-STEM) is an electron microscopy mode in which an annular detector yields Z-contrast images sensitive to atomic number, used to image single heavy atoms, dopants, and catalysts.
Annular epidermolytic ichthyosis
Annular epidermolytic ichthyosis (AEI), cyclic ichthyosis with epidermolytic hyperkeratosis, is a rare autosomal dominant KRT1/KRT10 variant of epidermolytic ichthyosis: neonatal blistering improves, then recurrent annular migratory scaly plaques with palmoplantar keratoderma appear.
Annular erythema
Annular erythema (erythema annulare centrifugum, figurate erythema) is a descriptive term for chronic ring-shaped skin eruptions that expand 2–5 mm/day with central clearing, usually on thighs and buttocks, mostly of unknown cause, treated with topical corticosteroids.
Annular erythema of infancy
Annular erythema of infancy (AEI) is a rare, benign skin condition of babies, typically aged 3 to 11 months, with recurrent ring-shaped patches that resolve without scarring.
Annular flow
Annular flow is a gas-liquid two-phase flow pattern in which a liquid film coats the pipe wall while gas flows as a fast core through the center.
Annular lichen planus
Annular lichen planus (ALP) is a ring-shaped variant of lichen planus with a raised active rim and cleared center, classically on the male genitalia and intertriginous areas; distinct from granuloma annulare, tinea, and annular atrophic LP.
Annular pancreas
Annular pancreas is a rare congenital ring of pancreatic tissue encircling the duodenum's second part, arising from ventral bud malrotation in week 7; it causes neonatal duodenal obstruction or adult pain, pancreatitis, and is treated by bypass surgery.
Annulation
Annulation is an organic reaction that constructs a new ring onto a molecule, typically forming two new bonds, distinct from cyclization and central to natural product synthesis.
Annulment
Annulment, or nullity, is a court declaration that a marriage or other legal act was never valid, unlike divorce which ends a valid marriage; covers void and voidable grounds, financial effects, religious annulment, and EU and arbitration uses.
Annulment in the Philippines
Annulment in the Philippines is a court process dissolving defective valid marriages, distinct from nullity; the Family Code allows only annulment and legal separation since the Philippines and Vatican City permit no absolute divorce.
Annuloplasty
Annuloplasty, including tricuspid annuloplasty, is a cardiac surgical technique that narrows a dilated heart valve annulus with a prosthetic ring or band, restoring leaflet coaptation to correct valve regurgitation.
Annunciation
The Annunciation, or Annunciation to Mary, is the Christian feast kept on 25 March, commemorating Gabriel's announcement to the Virgin Mary in Nazareth that she would bear Jesus.
Annunziata Rees-Mogg
Annunziata Mary Rees-Mogg, born 1979, is a British journalist and politician who served as a Brexit Party Member of the European Parliament from July 2019 until January 2020.
Annus horribilis
Annus horribilis, Latin for "horrible year", a formal phrase for a year of disaster, popularized by Queen Elizabeth II's 24 November 1992 Guildhall speech about the Windsor Castle fire and royal separations, modelled on annus mirabilis.
Annus mirabilis
Annus mirabilis, plural anni mirabiles, is Latin for "remarkable year", used in English for a year of wonders or disasters; it entered English through John Dryden's 1667 poem about 1666.
Annwn
Annwn (Annwfn), the otherworld of Welsh mythology: a realm of feasting, youth, and plenty ruled by Arawn in the Mabinogi, raided by Arthur in Preiddeu Annwfn; not a land of the dead, despite medieval identification with Hell.
Annwn Regio
Annwn Regio, named for the Welsh Otherworld, is a large mottled terrain region about 2300 km wide on Jupiter's moon Europa, officially named by the IAU in 2007 and known for its extensive chaos terrain.