Definitions

1. noun

A unit of measurement for the pressure of a fluid, typically used in the metric system. It is defined as the pressure that will support a column of mercury one millimeter high, and is equivalent to 1 kilopascal.

“The water tank’s pressure gauge reading was 10 psi, which indicated it was nearly full.”

2. noun

In parapsychology, a measure of psychic phenomena, such as extrasensory perception or telepathy. It is often measured on a scale of 0 to 100.

“The researcher conducted a series of experiments to measure the psi of the participants.”

3. noun

In psychology, a concept referring to the hypothetical, intangible, non-physical force that is thought to influence human behavior or other phenomena.

“The psychologist discussed the role of psi in shaping human decision-making.”

4. noun

In physics, a hypothetical field or force that is thought to be responsible for certain phenomena, such as psychokinesis or telekinesis.

“The physicist proposed a new theory of psi to explain the observed effects.”