Ab initio

ab-initioab initio calculationsde novofrom the startvoid ''ab initio
Ab initio is a Latin term meaning "from the beginning" and is derived from the Latin ab ("from") + initio, ablative singular of initium ("beginning").wikipedia
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First principle

first principlesfirst philosophical principlesfirst principals
In physics and other sciences, theoretical work is said to be from first principles, or ab initio, if it starts directly at the level of established science and does not make assumptions such as empirical model and parameter fitting.

In medias res

in media resbegins in the middle of the actionimmediately before a final battle over Paradise Falls
ab ovo, ab initio).

Ab initio quantum chemistry methods

ab initioab initio calculationAb initio calculations
The simplest type of ab initio electronic structure calculation is the Hartree–Fock (HF) scheme, in which the instantaneous Coulombic electron-electron repulsion is not specifically taken into account.

List of Latin legal terms

legal LatinList of legal Latin termscompos mentis

Ad fontes

original meaning
This phrase is related to ab initio, which means "from the beginning".

Ablative case

Ab initio is a Latin term meaning "from the beginning" and is derived from the Latin ab ("from") + initio, ablative singular of initium ("beginning").

Grammatical number

Ab initio is a Latin term meaning "from the beginning" and is derived from the Latin ab ("from") + initio, ablative singular of initium ("beginning").


legallawslegal theory
In law, ab initio refers to something being the case from the start or from the instant of the act rather than from when the court declared it so.

Void (law)

voidnull and voidvoid ab initio
Typically, documents or acts which are void ab initio cannot be fixed and if a jurisdiction, a document or an act is so declared at law to be void ab initio, the parties are returned to their respective positions that they were at the beginning of the event.

CAE Oxford

Oxford Aviation AcademySAS Flight AcademyOxford Aviation Training
CAE Oxford, part of CAE Inc., is an ab initio flight training network.

London Agreement (2000)

London AgreementLondon Protocol on patents
If the translation of the European patent was not provided to the national patent office within the prescribed time limit, the patent was "deemed to be void ab initio in that State."

De Havilland Tiger Moth

Tiger MothTiger Mothsde Havilland DH.82 Tiger Moth
A single prototype, designated the DH.82 Tiger Moth, was ordered by the British Air Ministry under Specification 15/31, which sought a suitable ab-initio training aircraft.

SIESTA (computer program)

SIESTA (Spanish Initiative for Electronic Simulations with Thousands of Atoms) is an original method and its computer program implementation, to perform efficient electronic structure calculations and ab initio molecular dynamics simulations of molecules and solids.

Kremenchuk flight college of National Aviation University

In 1952, the Tenth Military Aviation School for ab initio training of pilots of the Air Force was established by a decision of the Kiev military district command.


constitutionalconstitutionsconstitutional government
In most but not all modern states the constitution has supremacy over ordinary statutory law (see Uncodified constitution below); in such states when an official act is unconstitutional, i.e. it is not a power granted to the government by the constitution, that act is null and void, and the nullification is ab initio, that is, from inception, not from the date of the finding.

Pilatus PC-7

PC-7Pilatus PC-7 Turbo TrainerPilatus PC-7 Mk II
The type has been adopted by in excess of 20 air forces as their ab initio trainer, as well as multiple civilian operators.


PARATEC (PARAllel Total Energy Code) is a package that performs ab initio quantum mechanical total energy calculations using pseudopotentials and a plane wave basis set.