Adios, Ciao
This page is the CodyCross answer for the clue below from Physics, Group 1891, Puzzle 3 (Principle of Relativity).
Question is: Adios, Ciao
and the answer is: GOODBYE
Word Meaning:
GOODBYE — Farewell; a formula used to another person or persons when the speaker, writer, or person addressed is departing.
Definitions from Wiktionary.