adj

• Of an earlier time.
• (informal, of a person) Indicating affection and familiarity.
  "Finally, when they were all done slobbering around, old Sally introduced us."
• (obsolete) Excessive, abundant.
  "URSULA: Madam, you must come to your uncle. Yonder's old coil at home: it is proved, my Lady Hero hath been falsely accused, the prince and Claudio mightily abused;"

noun

• (with the, invariable plural only) People who are old; old beings; the older generation, taken as a group.
  "A civilised society should always look after the old in the community."
• (slang) A person older than oneself, especially an adult in relation to a teenager.
  "Near-synonyms: geezer, oldie, oldster; see also Thesaurus:old person"
• (slang, most often plural) One's parents.
  "I had to sneak out to meet my girlfriend and tell the olds I was going to the library."
• (Australia, uncountable) A typically dark-coloured lager brewed by the traditional top-fermentation method.
  "We crossed to the pub on the corner of Carlisle Street and I ordered two schooners of old for him and one of light for me."

name

• (publishing, linguistics) Initialism of Oxford Latin Dictionary.

noun

• (Internet) Abbreviation of online dating.