SENSEI

PRONUNCIATION: (SEN-say, sen-SAY)

MEANING: noun: A teacher, mentor, or a master in a field.

ETYMOLOGY: From Japanese sensei (teacher, master), from sen (earlier) + sei (birth), meaning a teacher was born earlier and knows more and has more experience. Earliest documented use: 1874.
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SEN-SEN - the Curiously Strong Mint of the 1950s (give or take 15 years)

SENSEKI - a dramatic move in Go that had better not be made

SENASE I - the first enzyme that catalyzes activity in the Upper House of Congress