Merriam-Webster's Collegiate® Dictionary, 11th Edition
DEAR
I. adjective
Etymology: Middle English dere, from Old English dēor Date: before 12th century severe , sore ,
II. adjective
Etymology: Middle English dere, from Old English dēore; akin to Old High German tiuri distinguished, costly Date: before 12th century noble , highly valued ; precious , affectionate , fond , high or exorbitant in price ; expensive , heartfelt , dearness noun
III. adverb Date: before 12th century dearly 3 , dearly 1 ,
IV. noun
Date: 13th century
a loved one ; sweetheart , a lovable person,
V. interjection
Date: 1694
— used especially to express annoyance or dismay