The phrase "definite highlight" means something that is exceptionally notable or outstanding. It refers to a particular moment or experience that stands out in a positive way. Full definition
London always offers a lot of amazing film events, awards and festivals but one definite highlight of the every season is the Somerset House... (thehollywoodnews.com)
Definite highlights in the career of a scientist are the bursts of elation that come with successful publication. (sciencemag.org)
Definite highlights include No Woman, No Cry, 1998, a tender portrait of a weeping female figure created in the aftermath of the Stephen Lawrence inquiry and The Upper Room 1999 — 2002, a darkened, walnut - panelled room containing thirteen canvases depicting rhesus macaque monkeys. (artlyst.com)