What is the meaning of Rationale?

An explanation of the basis or fundamental reasons for something.

A justification or rationalization for something.

A liturgical vestment worn by some Christian bishops of various denominations.

nominative/vocative/accusative singular neuter of ratiōnālis (rational, of reason)

The breastplate worn by Israelite high priests (Translation of λογεῖον (logeîon) or λόγιον (lógion, oracle) in the Septuagint version of Exodus 28.)

a rationale worn by a bishop

Source: wiktionary.org