Originally Posted by Howlin' Wolf
There are varying degrees of "refit" from simply "repair and resupply" to "major overhaul and upgrade". TMP was the latter while STIII would've been the former. I think the basic definition is: To be made fit again. If Enterprise has had two majors, she's probably had dozens of minors without even considering resupply.
EDIT: I forgot to add "I don't think she'd look any different."
with that in mind it makes me think of a major because when mentioned a refit to the commander of Starfleet, it was better to have her decommissioned. Would you rather decommission rather then repair and resupply?