DefinitionsLast updated: November 2, 2026

What does preferment mean?

Preferment has two meanings: in Rarified Life's usage it is the alternative to retirement, a structured redesign of life after a career, and in baking it is a portion of dough fermented ahead of the final mix. This site covers the first, but explains both so you land in the right place.

Is Preferment the life course the same as preferment in bread?

No. They share a word, not a subject. The Preferment course is an 8-week live program from Rarified Life. A bread preferment, such as a biga or poolish, is an ingredient made hours before baking.

Two meanings, side by side

Preferment as used by Rarified Life compared with preferment in baking
Aspect	Preferment course (Rarified Life)	Preferment in baking
What it is	An 8-week live course for redesigning life after a career	Dough fermented ahead of the final mix
Main parts	Six modules, a book, and homework	Flour, water, and yeast
Time involved	Eight weekly live sessions	Several hours, up to 12 to 16 hours (King Arthur Baking)
Common types	One course, with books and 1:1 coaching listed as coming soon	Biga, poolish, pâte fermentée, sponge, sourdough starter

Preferment as a way to replace retirement

Rarified Life's tagline is “Ditch retirement... try Preferment instead.” In this sense, Preferment is a deliberate redesign of the years after a career around identity, motivation, values, accountability, and a named mission. It is built for high achievers planning life after 50. Read the full Preferment course guide or explore the Preferment platform.

Preferment in baking, by the numbers

If you arrived looking for bread, these published facts cover the basics. Each is quoted from its source.

A preferment can be quite stiff in texture, or of loose consistency (100% hydration).
Source: King Arthur Baking
A biga is made with flour, water, and a small amount of yeast; the yeast can be as little as 0.1% of the biga flour weight.
Source: King Arthur Baking
Once mixed, a preferment is left to ripen for at least several hours, and for as much as 12 to 16 hours.
Source: King Arthur Baking
A poolish is by definition made with equal weights of flour and water (100% hydration) and a small portion of yeast.
Source: King Arthur Baking
In a side-by-side test, the biga, poolish, and pâte fermentée were fermented for 12 hours, and the sponge for just 1 hour, since it is a quick preferment containing all the yeast of the recipe.
Source: ChainBaker
In that same test, the doughs had a hydration of 62%, were made with white bread flour, and bulk fermentation took around 1.5 hours.
Source: ChainBaker

For full recipes, troubleshooting a poolish that did not rise, or fridge storage times, a dedicated baking resource is the right place to go. Start with King Arthur Baking's preferment reference or ChainBaker's comparison of yeasted preferments.

Questions about the word preferment

Is this site about bread preferments?

No. This site covers Preferment, the life-redesign course and platform from Rarified Life. In baking, a preferment is a portion of dough fermented ahead of the final mix. If you came for bread, King Arthur Baking’s preferment reference and ChainBaker’s comparison of biga, poolish, pâte fermentée, and sponge are good starting points.

What is the purpose of preferment in bread?

In baking, a preferment is mixed ahead of the final dough and left to ripen, which bakers use to build flavor and dough strength. King Arthur Baking notes that a preferment is left to ripen for at least several hours, and for as much as 12 to 16 hours, before it goes into the final dough.

Is preferment the same as sourdough starter?

Not exactly. A sourdough starter is one kind of preferment that relies on wild yeast, while yeasted preferments such as biga and poolish use a small amount of commercial yeast. King Arthur Baking notes that in a biga the yeast can be as little as 0.1% of the biga flour weight.

What is a poolish?

A poolish is a yeasted preferment made, by definition, with equal weights of flour and water, which is 100% hydration, plus a small portion of yeast, according to King Arthur Baking. In ChainBaker’s side-by-side test, the biga, poolish, and pâte fermentée fermented for 12 hours, while the sponge fermented for just 1 hour.

Can I make pizza dough with poolish?

Yes, poolish is commonly used in pizza dough as well as bread. It is mixed ahead and left to ripen before going into the final dough. For recipes and timing, a dedicated baking resource such as King Arthur Baking is the right place to look; this site focuses on the Preferment life course.

Why is it called Preferment instead of retirement?

Rarified Life uses the word Preferment to replace the idea of retirement as an ending. Its own tagline is “Ditch retirement... try Preferment instead.” The course treats the years after a career as an ascension: a chapter you design around your values and strengths, rather than a stop sign at the end of work.

Read all Preferment questions