Sensei (先生): a Master that is willing to teach.
Literally: Sen: Further, Forward Sei: Life;
‘The one that brings others forward in life’
Although it is tempting to translate ‘Sensei’ as Teacher, there is a subtle difference due to the differences in the Western and Japanese teaching systems.
It is the Sensei’s greatest honor when his pupil becomes better than the master. To understand this difference please read about the ShuHaRi learning system