cal‧i‧bre British English ; caliber American English
the level of quality or ability that someone or something has achieved
of somebody's calibre
Where will we find another man of his calibre?
The school attracts a high calibre of student.
of high/the right etc calibre
The paintings were of the highest caliber.
of this/that calibre
The city needs a hotel of this calibre (=of this high standard).
the width of the inside of a gun or tube:
a .22 caliber rifle
the width of a bullet