Origin and history of doyen

early 14c., an ecclesiastical title, etymologically "head of a group of ten," from Old French deien (12c., Modern French doyen), from Late Latin decanus "head of a group of 10 monks in a monastery," from earlier secular meaning "commander of 10 soldiers" (which was extended to civil administrators in the late empire), from Greek dekanos, from deka "ten" (from PIE root *dekm- "ten"). It replaced Old English teoðingealdor.

Sense of "president of a faculty or department in a university" is by 1520s (in Anglo-Latin from late 13c.). Extended meaning "oldest member in length of service in any constituted body" is from mid-15c. Related: Deanery.

"leading or senior woman in a group or society," 1905, from fem. of French doyen (see doyen). As a type of pear, from 1731.

Proto-Indo-European root meaning "ten."

It might form all or part of: cent; centenarian; centenary; centi-; centime; centurion; century; centennial; cinquecento; dean; deca-; decade; decagon; Decalogue; Decameron; decapod; decathlon; December; decennial; deci-; decile; decimal; decimate; decimation; decuple; decussate; denarius; denier (n.) "French coin;" dicker; dime; dinar; doyen; dozen; duodecimal; duodecimo; eighteen; fifteen; fourteen; hecatomb; hendeca-; hundred; icosahedron; nineteen; nonagenarian; octogenarian; Pentecost; percent; quattrocento; Septuagint; sexagenarian; seventeen; sixteen; ten; tenth; thirteen; thousand; tithe; -ty (1).

It might also be the source of: Sanskrit dasa, Avestan dasa, Armenian tasn, Greek deka, Latin decem (source of Spanish diez, French dix), Old Church Slavonic deseti, Lithuanian dešimt, Old Irish deich, Breton dek, Welsh deg, Albanian djetu, Old English ten, Old High German zehan, Gothic taihun "ten."