It means that whatever you're reacting the chlorine with with be totally reacted with none left over.
This means the amount of chlorine is not the limiting factor in your reaction. You may calculate as though it exists in unlimited amounts.<br />
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It means that chlorine is <b>not</b> the limiting reagent.
This would indicate a reaction taking place in an environment (flask,etc.) which contains significantly more chlorine than actually consumed by the stoichiometry of the reaction. Chlorine is a very strong oxidizer, stronger than oxygen, so an excess will speed up the reaction but can also lead to an explosion and the release of toxic (deadly) gaseous byproducts. Extreme caution would be wise. Ask anytime, it is easier than healing, as an amputee in a wheelchair I can give such advice from real life experience...