arch

n. vault, upward curve; entrance with a curved top, vaulted doorway

v. make arched, make vaulted, build an arch; be arched, be vaulted

pref. chief, principal

adj. shrewd, cunning, sly; chief, main, principal

An arch is a curved structure capable of spanning a space while supporting significant weight (e.g. a doorway in a stone wall). The arch appeared in Mesopotamia, Indus Valley civilization, Egypt, Assyria, Etruria, and later refined in Ancient Rome. The arch became an important technique in cathedral building and is still used today in some modern structures such as bridges.
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"ARCH" redirects here. For the children's rights organization, see Action on Rights for Children. In econometrics, an autoregressive conditional heteroskedasticity (ARCH, Engle (1982)) model considers the variance of the current error term to be a function of the variances of the previous time period's error terms. ARCH relates the error variance to the square of a previous period's error. It is employed commonly in modeling financial time series that exhibit time-varying volatility clustering, i.e. periods of swings followed by periods of relative calm.
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Arch a structure of bowlike or curved outline. arch of aorta , aortic arch the curving portion between the ascending aorta and the descending [more]Arch - Community and Resources

Noun
1. a curved shape in the vertical plane that spans an opening
(hypernym) curve, curved shape
(derivation) curve, arc
2. a curved bony structure supporting or enclosing organs (especially arches of the feet)
(hypernym) skeletal structure
(hyponym) metatarsal arch
(derivation) curve, arc
3. a passageway under an arch
(synonym) archway
(hypernym) entrance, entranceway, entryway, entry, entree
(part-holonym) wall
(derivation) curve, arc
4. (architecture) a masonry construction (usually curved) for spanning an opening and supporting the weight above it
(hypernym) structure, construction
(hyponym) abutment arch
(part-holonym) bridge, span
(part-meronym) keystone, key, headstone
(derivation) curve, arc
(classification) architecture
Verb
1. form an arch or curve; "her back arches"; "her hips curve nicely"
(synonym) curve, arc
(hypernym) bend, flex
(hyponym) camber
Adjective
1. (of persons) highest in rank or authority or office; "his arch rival"
(synonym) arch(a)
(similar) important, of import
2. (used of behavior or attitude) characteristic of those who treat others with condescension
(synonym) condescending, patronizing, patronising
(similar) superior
3. expert in skulduggery; "an arch criminal"
(synonym) arch(a)
(similar) skilled

architectural, of architecture, of the design of buildings and other structures