🔣 Greek letters 🔤 Letter X name 🍔 A Brazilian sandwich

xis

1 9.9

The plural of the Greek letter Xi used as symbols in math and science

noun
/zaɪs/

Specialized

: xis

When writing about the Greek alphabet, you might mention xis as the 14th letter.

And so we only need to quantize Xis and the XI, they're just a free field.

Examples

Do there exist Xis such that the formula's true?
And so we only need to quantize Xis and the XI, they're just a free field.

MIT OpenCourseWare
In mathematics, we often use xis to represent unknown variables in equations.
The professor explained that the xis in the equation were crucial for understanding the theory.

Surface Forms

xis plural

Morphology

xis = xi (transparent) = xi + s

Regular English plural formed by adding -s to the noun 'xi'; the plural meaning is directly derived from the singular.

Etymology

Xis is the plural of the Greek letter xi, so it means more than one xi symbol as used in math and science. That is why you see xis on a board when a teacher writes several variables.