A group of results of repeated analyses completed by using a single analytical method on samples of a homogeneous substance.

An arrangement of circuit components end to end to form a single path for current.

1. A number of rocks, minerals, or fossils that can be arranged in a natural sequence due to certain characteristics, such as succession, composition, or occurrence.

2. A time-stratigraphic unit, below system and above stage, composed of rocks formed during an epoch of geologic time.

An expression of the form x₁ + x₂ + x₃ + . . ., where x_i are real or complex numbers.

A collection of spectral lines of an atom or ion for a set of transitions, with the same selection rules, to a single final state; often the frequencies have the general formula [R /(a + c₁)²] - [R /(n + c₂)²], where R is the Rydberg constant for the atom, a and c₁ and c₂ are constants, and n takes on the values of the integers greater than a for the various lines in the series.