D defs.my
Entry 4 senses Webster, 1913

Monumental

/mänˌ-yəm-ĕn'-təl/ · Mon·u·men·tal · IPA /ˌmɒnjʊˈmɛntəl/
01 a. Of, pertaining to, or suitable for, a monument; as, a monumental inscription.
  1. 1.
    Of, pertaining to, or suitable for, a monument; as, a monumental inscription.
  2. 2.
    Serving as a monument; memorial; preserving memory.
    “A work outlasting monumental brass.” Pope.
  3. 3.
    Of lasting significance; as, a monumental work of literature; a monumental accomplishment.
  4. 4.
    Exceptionally large in quantity, quality, or degree; as, a monumental amount of work to be done