reversible

Something that's reversible can be turned around, undone, or changed back to its original state. Think of a reversible jacket: you can wear either side facing out. It is not just about physical objects. A decision can be reversible if it can be changed, and a process can be reversible if the steps can happen in the opposite order. Some cities even use reversible lanes on busy roads, changing the direction of traffic to help with the morning commute. In chemistry, a reversible reaction can move both forward and backward, much like building with blocks: you can put the pieces together to make something, then take them apart to get the original pieces back.

The word "reversible" describes something that can be changed back to its original condition or state. It suggests that an action can be undone, a process can run the other way, or an item can be used in more than one way. For example, a reversible coat lets you wear either side on the outside, giving you two looks in one garment.

But this idea is not limited to physical objects. A decision, policy, or legal ruling is reversible if it can be changed or canceled. In science, a chemical reaction is reversible if the products can turn back into the original reactants. Water freezing into ice and then melting back into liquid shows this kind of change clearly. In mathematics, a reversible operation has an inverse that fully undoes its effect.

The idea of reversibility often highlights flexibility and the absence of permanence. It stands in contrast to things that are "irreversible." A pencil mark, for example, is often reversible because you can erase it, while permanent marker usually is not. Whether you are talking about clothing, traffic flow, chemistry, math, or everyday choices, "reversible" points to the ability to go back, undo a step, or switch direction.