na-adjective
provisional; temporary; tentative; interim
Used for measures, agreements, or arrangements that are not final and may change later. Often appears in formal or official contexts.
これは暫定的な措置です。
This is a provisional measure.
暫定
Let's tentatively set the schedule.
仮 is a prefix or noun meaning 'temporary' or 'provisional', often used in compounds like 仮契約 (provisional contract). 暫定的 is more formal and adjectival.
From 暫定 (ざんてい, 'provisional, temporary') + 的 (てき, '-like, -ish'), forming an adjectival noun. 暫定 itself is composed of 暫 (ざん, 'a while, temporarily') and 定 (てい, 'decide, fix').