The spelling of the adjective is hyphenated "multi-year."
(Only Wiktionary shows a single word, unhyphenated form.)
multi-task or Multitask -the hyphen is not necessary-
The term for multi-family dwelling buildings is "apartments."
The word is spelled as one word "multitasking" but is occasionally seen hyphenated as in (multi-tasking).
That is correct. It may also be spelled without the hyphen
That is the correct spelling (menorah) of a multi-armed Jewish candlestick.
"Multicolored" in French is spelled "multicolore".
That is the correct spelling of the word "multitask" (to do several things concurrently).
It is written as one word and the correct spelling is multidisciplinary.
Multi-Color Corporation (LABL) had its IPO in 1987.
The word is properly used as an adjective, multidisciplinary, to mean including parts of many related fields or approaches. The term multi-discipline is often used, technically improperly, as a noun adjunct.
nxtaum
The prefix is spelled multi- (many).The word sought may be moldy (UK may be mouldy), having mold on it.