マックス (makkusu) means “max” | MotiTan Japanese Dictionary

More examples

この設定では、音量をマックスにしても音が割れません。ko no set tei de wa on ryō o ma kku su ni shi te mo oto ga wa re ma se n

With this setting, the sound does not distort even when the volume is at max.

Shows a quantity, condition, or intensity reaching the highest level that it can attain, as in マックス (makkusu).

最大saidai: The greatest possible amount, size, or degree of something.
最高saikō: The highest position, degree, or quality on a scale.

数量や能力などの限度。また、勢い・気分などが最高の状態。sū ryō ya nō ryoku na do no gen do ma ta ikio i ki bun na do ga sai kō no jō tai

マックス (makkusu) comes from English max, which shortens maximum; maximum ultimately comes from Latin maximus, meaning "greatest".

The phrase テンションマックス (tenshon makkusu) describes someone whose energy or excitement is at its highest, showing that マックス (makkusu) extends beyond physical quantities.