The moisture present in a material, as determined by definite prescribed methods, expressed as a
percentage of the weight of the sample on either of the following bases: (1) ORIGINAL
WEIGHT — This is variously referred to as moisture content or moisture “as is” or “as received,”
or (2) MOISTURE-FREE WEIGHT — This is also referred to as moisture regain (frequently
contracted to “regain”) or moisture content on the “oven-dry,” “moisture-free,” or “dry” basis.