supposed

De mars zou in maart moeten plaatsvinden.

(intransitive, transitive) To take for granted; to conclude, with less than absolute supporting data; to believe.
(transitive) To theorize or hypothesize.
(transitive) To imagine; to believe; to receive as true.
(obsolete, transitive) To reckon to be, to account or esteem as.
(transitive) To require to exist or to be true; to imply by the laws of thought or of nature.
(obsolete, transitive) To put by fraud in the place of another; to substitute fraudulently.