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What does main sequence mean?

Looking for the meaning or definition of the word main sequence? Here's what it means.

Proper noun
  1. (astronomy) A major grouping of stars that creates a narrow band from the upper left to the lower right when plotted by luminosity and surface temperature on a Hertzsprung-Russell diagram.
  2. The area on the Hertzsprung-Russell diagram in which the main sequence is located.
  3. Used other than with a figurative or idiomatic meaning: see main,‎ sequence.
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Examples
The star then reaches the main sequence, where it remains for most of its active life.
Several million years is a long time in comparison to a human life span, but it is short in comparison to the life span of main sequence stars.
The lower mass limit for a main sequence star is about 0.08 that of our Sun or 80 times the mass of Jupiter.
Therefore no low mass star in the Universe has yet completed its time on the main sequence.
But the stars of mass lower than 8-10 solar masses have just started evolving beyond the main sequence.
Thus, the Sun, a main-sequence star, is classified as G2 V, in which the V denotes main sequence.

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