大半 [たいはん] – majority; mostly; generally

• 大 [ダイ・タイ・おお-・おおきい] – big; large
• 半 [ハン・なかば] – half; middle

In Japanese, a “big half” is a majority.  Doesn’t necessarily make sense mathematically, but I rather like it.

大半の ATMカードがご利用いただけます。 Most ATM cards accepted.