Definition of "grandeur"

I wrapp’d myself in grandeur then,And donn’d a visionary crown ——

1829, Edgar Allan Poe, “Tamerlane”, in Al Aaraaf, Tamerlane and Minor Poems

So much of what followed from the drawing boards of others will have been designed with the demands, effort and grandeur of Primrose Hill [tunnel] in the back of their minds.

2020 August 26, Tim Dunn, “Great railway bores of our time!”, in Rail, page 44

In a tightly choreographed ceremony filled with imperial grandeur, Xi and Putin then walked towards each other and met in the middle, smiling as they shook hands.

2023 March 21, Pjotr Sauer, “Putin’s two-day charm offensive with Xi underlines who’s boss”, in The Guardian‎