Logical means following clear, sensible reasoning where each step makes sense based on what came before. When you think logically, you connect ideas in ways that hold together, like links in a chain.

If your friend says “I'm bringing my umbrella because the weather forecast predicts rain,” that's logical reasoning. The conclusion (bringing an umbrella) follows sensibly from the evidence (rain is predicted). But if she said “I'm bringing my umbrella because I like strawberries,” that wouldn't be logical since one idea doesn't connect to the other.

In math, a logical solution means working through a problem step by step, where each calculation builds on the previous one. In a mystery story, a logical detective considers the clues carefully and draws conclusions that make sense based on the evidence, rather than wild guesses.

The opposite of logical is illogical, which means not making sense. Sometimes people make illogical arguments when they let strong feelings override careful thinking, or when they jump to conclusions without good reasons.

When someone says “that's logical,” they mean the reasoning is sound and convincing. Scientists value logical thinking because it helps them understand how the world works. Computer programmers think logically when writing code, ensuring each instruction follows correctly from the last. Being logical doesn't mean being cold or unfriendly. It just means thinking clearly and carefully about how ideas connect.