faɪ, fɪ

Definitions

1. noun

The 21st letter of the Greek alphabet.

“The mathematician used the Greek letter phi to represent the golden ratio.”

2. noun

A symbol, especially the Greek letter phi, used to represent something.

“The artist used the phi symbol to represent the infinite in her sculpture.”

3. noun

The ratio of a phyllotactic spiral’s circumference to its length, approximately equal to the golden ratio.

“The biologist studied the phi ratio of the plant’s leaves to understand its growth pattern.”

4. adjective

Related to or resembling the Greek letter phi.

“The phi curve is a mathematical concept used in architecture to create visually appealing designs.”

5. adjective

Relating to the golden ratio or the phi ratio.

“The phi design of the new skyscraper was a hit among architects and designers.”