Use ago to mean "earlier" or "in the past." Dinosaurs lived a long time ago.

The adverb ago refers to a time before the present moment, sometimes in the distant past, and sometimes more recently: "She just left for her appointment ten minutes ago." When you talk about the more remote past, you might say "long ago" or "a long time ago." Ago was originally a shortened form of agone in Middle English, "departed or passed away."

Definitions of ago
  1. adjective
    gone by; or in the past
    “two years ago
    “`agone' is an archaic word for ` ago'”
    synonyms: agone
    earlier than the present time; no longer current
  2. adverb
    in the past
    “long ago
    “sixty years ago my grandfather came to the U.S.”
Word Family

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