English · Word Candidate

X

/ɛks/

Proposed by a contributor, not yet supported by evidence.

Also seen as: Xes

Sense 1

Both English Tiếng Việt

Meaning · English

An unknown quantity or unknown value.

Nghĩa · Tiếng Việt

số lượng hoặc giá trị chưa biết

Machine-translated — suggest a fix

Numeral

Examples

Let X represent the forecast traffic flow in 20 years’ time.

Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01)

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).

Sense 2

Both English Tiếng Việt

Meaning · English

Any mark that looks like that letter, such as a mark made by a person who cannot read or write in lieu of a signature.

Nghĩa · Tiếng Việt

dấu hiệu giống chữ cái đó

Machine-translated — suggest a fix

Noun

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).

Sense 3

Both English Tiếng Việt

Meaning · English

The spot behind the goal.

Nghĩa · Tiếng Việt

khu vực phía sau khung thành

Machine-translated — suggest a fix

Noun

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).

Sense 4

Both English Tiếng Việt

Meaning · English

Intersex or non-binary (in passports and identification documents).

Nghĩa · Tiếng Việt

giới tính không xác định hoặc phi nhị nguyên

Machine-translated — suggest a fix

Adjective

Examples

So last summer, when the Massachusetts State Legislature became one of the first in the nation to consider a bill to add an “X” option for nonbinary genders to the “M” and “F” on the state driver’s license, El, 17, was less surprised than some at the maneuver that effectively killed it.

Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01)

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).

Common questions

What does “X” mean?

An unknown quantity or unknown value.

Is “X” formal or informal?

No register label has been reviewed yet — treat it as neutral and check the usage notes above.