Friends - I need your expertise. ‼️ Is it onsite or on-site when referring to property management? Hyphen or no hyphen? ???? Merriam Webster says on-site should be hyphenated. The Cambridge dictionary includes onsite (without the hyphen) and on-site (hyphenated), while the American Heritage dictionary only lists onsite (no hyphen).
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On-site is the preferred use when being used as an adjective or adverb before a noun, as is off-site. On site or off site are preferred use after a noun or pronoun when used as a location phrase versus referring directly to the noun.
Onsite is accepted more these days in American English as hyphen use fades, but offsite is less accepted in the dehyphenization "movement."
Technically onsite or on-site are both correct, but on-site is still, for now, the preferred grammatical term.