/ ˈgrændʒə(r); NAmE ; -djə(r)/ noun [ U ]
1.
the quality of being great and impressive in appearance
SYN splendour :
the grandeur and simplicity of Roman architecture
The hotel had an air of faded grandeur.
2.
the importance or social status sb has or thinks they have :
He has a sense of grandeur about him.
She is clearly suffering from delusions of grandeur (= thinks she is more important than she really is) .
—see also grand
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WORD ORIGIN
late 16th cent. (denoting tall stature): from French , from grand great, grand, from Latin grandis full-grown, big, great.