Homogeneous (pronounced like “hoh-moh-JEE-nee-us”) describes something that's the same all the way through, with all its parts alike or evenly mixed.

When you stir chocolate powder into milk until no clumps remain and every sip tastes exactly the same, you've created a homogeneous mixture. Scientists use this word to describe solutions where you can't see separate ingredients anymore: salt water is homogeneous because the salt dissolves completely and spreads evenly throughout.

The word also describes groups where everyone or everything is very similar. A homogeneous classroom might have students all the same age and from similar backgrounds. A homogeneous forest might contain only pine trees, while a diverse forest mixes oaks, maples, birches, and pines together.

The opposite is heterogeneous (pronounced like “het-er-oh-JEE-nee-us”), which describes mixtures or groups with distinct, different parts. Trail mix is heterogeneous: you can see and pick out the raisins, nuts, and chocolate chips. A heterogeneous group of students might include different ages, backgrounds, and experiences.

In mathematics, homogeneous can describe equations where all terms have the same degree, but you'll encounter that meaning later in algebra.