SENIOR, SENIORITY
ADJECTIVES
► ELDER senior; that ranks before others by virtue of longer service; said of officials, etc. → 1642 obs.
► ELDEST senior in rank or standing → 1721 military usage, obs.
ADVERBS
► UPSTAIRS into a senior position → 1990s sl.
NOUNS
► ELDERSHIP the position of being senior or elder; seniority, precedence of birth, primogeniture → 1549
► UPSTAIRS a senior position; a higher authority → 1950s sl.
► WHISKERS seniority or tenure on a job → 1973 US sl.
Lexicophilia 