English · Word Candidate

phi

/faɪ/

Proposed by a contributor, not yet supported by evidence.

Also seen as: phis

Sense 1

Both English Tiếng Việt

Meaning · English

Φ, the 21st letter of the Euclidean and modern Greek alphabet, usually romanized as "ph".

Nghĩa · Tiếng Việt

Chữ cái thứ 21 trong bảng chữ cái Hy Lạp

Machine-translated — suggest a fix

Noun

Sources & notes

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

Both English Tiếng Việt

Meaning · English

The golden ratio.

Nghĩa · Tiếng Việt

Tỷ lệ vàng

Machine-translated — suggest a fix

Noun

Sources & notes

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

What does “phi” mean?

Φ, the 21st letter of the Euclidean and modern Greek alphabet, usually romanized as "ph".

Is “phi” formal or informal?

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

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