1. A person or something that comes before an action or a situation, as in a job, a method, etc.: Taking advanced computer classes, especially programming, can be a precursor to being qualified for better paying jobs with businesses or individuals.
2. A person, animal, or thing that happens before and indicates the approach of someone or something else; a harbinger or foretelling: The budding of tree leaves is a precursor of spring and so is the sight of certain birds, such as robins.
3. Someone or something that comes before and is often considered to lead to the development of another person or thing: Small tremors can be precursors to earthquakes.

Lightening is almost always the precursor to thunder.

6. An individual who held a position or a job before someone else: Being a skilled writer was Mark's precursor to being a full-time reporter for the local newspaper. © ALL rights are reserved.
© ALL rights are reserved.

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A chemical compound; such as, carbon monoxide, methane, non-methane hydrocarbons, and nitrogen oxides, which in the presence of solar radiation will react with other chemical compounds to form ozone.