Definition of open mind in US English:

open mind

noun

  • A mind that is accessible or receptive, especially to new arguments or ideas; a candid or honest mind. Also (especially in later use): an unprejudiced mind. Frequently in "to keep an open mind" and variants: to be ready to consider a matter without prejudice.

Origin

Mid 18th century; earliest use found in Mark Akenside (1721–1770), poet and physician. From open + mind.

Pronunciation

open mind

/ˌəʊp(ə)n ˈmʌɪnd/