Definitions, notation and terminology

In this study, … is used as in X

X terms this …

X labels this …

…, as defined by X

… can be classified, according to or using X’s terminology, as …

various notations are used in the literature

…, a term coined by X

The term … was coined by X to denote or describe …

… was first used by X to describe etc.…

The first use of … was …

The concept of … was introduced by X to …

The notion of … derives from …

This principle etc. is known as … after X

… is named after X, who …

… adopted from X

… largely or to some extent borrowed from X

It seems best, following X, to …

X recognizes two etc. types of …, which she or he terms …

various definitions have been suggested in the literature

a widely accepted definition

… is usually accepted as …

For the sake of clarity, we have retained X’s nomenclature …

The term … is commonly or often or sometimes used to refer to …

… is conventionally labelled GB or labeled US …

… can be labelled GB or labeled US … according to the convention …

For this reason … is often labelled GB or labeled US …

Most usually … refers to …

Usually, … is labelled GB or labeled US …

it is customary to speak of …

what has come to be known as …

… is or are also known as …

… (also known as …)

… variously termed …

the terms … and … are sometimes, often etc. used interchangeably

Some writers etc. use the terms … and … interchangeably

… later modified by X

X uses … in a somewhat restricted sense

The term … originally referred to …; however, it is now used …

For historical reasons, … is often labelled GB or labeled US …

… are traditionally categorized US and GB or categorised GB as …

… are traditionally divided into a number of categories or groups etc. …

the so-called …

This definition differs to some extent from …

Unless stated otherwise, …

… unless indicated otherwise

apart from the … noted or discussed above

The term is not used here in the sense of …

The term is not used here in the conventional sense

The term … is taken from X, but is here used differently: in this study it refers to or is defined as …