Fractional means relating to fractions or being only a part of something whole, not the complete amount.

In math class, you work with fractional numbers like ½ or ¾, numbers that represent pieces of a whole rather than complete units. When you eat a fractional portion of a pizza, you're eating part of it, not the entire thing.

Outside of math, fractional describes anything that's incomplete or partial. A fractional improvement means something got a little better, but not dramatically. If your soccer team shows fractional progress during the season, they've improved somewhat but haven't transformed completely. When scientists measure something down to fractional degrees, they're being extremely precise, noting even tiny partial differences.

Just as breaking a cookie creates pieces, fractional quantities are pieces of larger wholes.

You might also hear about fractional ownership, where multiple people each own a part of something expensive like an airplane or vacation home. Each owner gets to use it for a fraction of the year. This shows how fractional can mean both mathematically precise (exactly ⅛ ownership) and generally partial (just a portion, not the whole).