# abscissa

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## English

### 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. [First attested in the late 17th century.][1]
Coordinate term: ordinate
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.
Coordinate term: ordinate

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

## Latin

### Etymology 1

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

#### Pronunciation 1

##### Noun

abscissa f (genitive abscissae); first declension

1. 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
• Norwegian Bokmål: abscisse
• Portuguese: abscissa
• Italian: ascissa

#### Pronunciation 2

##### Noun

abscissā f

1. ablative singular of abscissa

### Etymology 2

See the etymology of the corresponding lemma form.

#### Participle

abscissa

1. inflection of abscissus:

abscissā

## Portuguese

### Pronunciation

• (Brazil) IPA(key): /a.biˈsi.sɐ/, /abˈsi.sɐ/
• (Southern Brazil) IPA(key): /abˈsi.sa/, /a.biˈsi.sa/

• Hyphenation: abs‧cis‧sa

### 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