# abscissa

## English

A point in the Cartesian plane; x is the abscissa.

### Etymology

By ellipsis from Latin [linea] abscissa, feminine of abscissus, perfect passive participle of abscindō (cut off). See abscind.

### Pronunciation

• (US) IPA(key): /æbˈsɪs.ə/
•  Audio (US) (file)
• Hyphenation: ab‧scis‧sa

### Noun

abscissa (plural abscissas or abscissae or abscissæ)

1. (geometry) The first of the two terms by which a point is referred to, in a system of fixed rectilinear coordinate (Cartesian coordinate) axes. The abscissa is also known as the "x" coordinate of a point, shown on the horizontal line, with the ordinate, also known as the "y" coordinate, shown on the vertical line. [First attested in the late 17th century.][1]
The point ${\displaystyle (3,2)}$  has 3 as its abscissa and 2 as its ordinate.
2. (geometry) The horizontal line representing an axis of a Cartesian coordinate system, on which the abscissa (sense above) is shown.

#### Usage notes

Originally, it referred to the portion of a line between a fixed point on that line and the intersection of that line with an ordinate.[1]

### References

1. “abscissa” in Lesley Brown, editor-in-chief; William R. Trumble and Angus Stevenson, editors, The Shorter Oxford English Dictionary on Historical Principles, 5th edition, Oxford; New York, N.Y.: Oxford University Press, 2002, →ISBN, page 8.

## Latin

### Etymology 1

From abscissus, perfect passive participle of abscindō (tear away)

#### Noun

abscissa f (genitive abscissae); first declension

1. (mathematics) abscissa
##### Declension

First-declension noun.

Case Singular Plural
Nominative abscissa abscissae
Genitive abscissae abscissārum
Dative abscissae abscissīs
Accusative abscissam abscissās
Ablative abscissā abscissīs
Vocative abscissa abscissae
##### Descendants
• English: abscissa
• Irish: aibsíse
• Portuguese: abscissa
• Italian: ascissa

### Etymology 2

See the etymology of the main entry.

abscissa

abscissā

## Portuguese

### Noun

abscissa f (plural abscissas)

1. (geometry) abscissa (first of two coordinates)

## Swedish

### Noun

abscissa c

1. Alternative spelling of abskissa; abscissa

#### Declension

Declension of abscissa
Singular Plural
Indefinite Definite Indefinite Definite
Nominative abscissa abscissan abscissor abscissorna
Genitive abscissas abscissans abscissors abscissornas