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.
The term "multi-year" is typically hyphenated when used as a compound adjective before a noun, such as in "multi-year contract." However, it can appear as two separate words, "multi year," when used in other contexts. Always consider the specific usage and style guidelines you are following.
"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