Black's Law Dictionary defines probable cause as

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Probable cause is about reasonable grounds to believe something true in a criminal context. Black’s Law Dictionary defines it as a reasonable ground to suspect that a person has committed or is committing a crime, or that a place contains specific items connected with a crime. This means the standard requires more than a mere hunch but does not require absolute certainty. The facts and circumstances known to the officer must be enough to lead a reasonable person to believe the crime is ongoing, or that evidence linked to a crime is present at a location. It’s not limited to warrants—probable cause can justify warrantless arrests or searches in appropriate situations, with warrants simply being a judicial check that probable cause exists before a search or seizure. The other descriptions miss the essential element of grounded factual basis: a training intent or expertise isn’t the definition, and a mere hunch isn’t enough to meet the standard.