(geology) A very large-scale lithostratigraphic sequence in the rock record that represents a complete cycle of marine transgression and regression on a craton over a geologic time scale.

plural of cratonic sequence

Alternative form of main sequence.

plural of arithmetic sequence

(mathematics) Synonym of arithmetic progression

a sequence of DNA, RNA, or amino acids that reflects the most common choice of base or amino acid at each position.

(genetics) The sequence at the 5' end of an mRNA molecule that is not translated into protein.

plural of rock sequence

A DNA or protein sequence with a high degree of sequence identity to other sequences in that species, or in others.

(astronomy) A major grouping of stars represented on a Hertzsprung-Russell diagram by a nearly uniform band of increasing luminosity with increasing surface temperature.