Learn how to say Bastion correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word bastion:
1a projecting part of a fortification built at an angle to the line of a wall, so as to allow defensive fire in several directions.
a natural rock formation resembling a man-made bastion.
2an institution, place, or person strongly maintaining particular principles, attitudes, or activities:
cricket’s last bastion of discrimination
mid 16th century: from French, from Italian bastione, from bastire ‘build’