(accounting) A method of inventory accounting that values items withdrawn from inventory at the cost of the oldest item assumed to remain in inventory.

(idiomatic) People will be dealt with in the order they arrive.

Alternative spelling of first-come-first-served

Describing a process of dealing with people using the principle "first come, first served".

(operations) A service policy in which the first to arrive for service receives the service first.

The first element of a full name in cultures that place the given name first.

The ordinal form of the number eighty-one, describing a person or thing in position number 81 of a sequence.

One of eighty-one equal parts of a whole.

The ordinal form of the number hundred one.

The person or thing in the hundred-first position. / One of a hundred one equal parts of a whole.