# Shapiro time delay

> English word · Noun

## Definitions
1. A time delay in the round trip travel time for radar signals passing near a massive object, caused by time dilation.

## Etymology
Named after Irwin I. Shapiro who predicted the effect in 1964.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/shapiro-time-delay