The term "AMB" has multiple meanings depending on the context. Here are some of the most common definitions:

• At My Best: A phrase used in Canada.
• All My Best: A phrase used in informal writing.
• Ambulance: A vehicle used for transporting sick or injured people to a hospital.
• Ambulatory: Referring to the ability to walk or move around.
• AmB: A polyene antifungal medication.
• Ambassador: A high-ranking diplomat who represents a country in another country.
• Active Magnetic Bearing: A type of bearing that uses magnetic fields to levitate a rotating shaft.
• Advanced Memory Buffer: A technology used in Fully Buffered DIMM memory.
• Al-Aqsa Martyrs Brigades: One of the armed sections of the Palestinian Fatah movement.

It is important to understand the context in which "AMB" is being used to determine its meaning.