Abatement means: The act of abating, or the state of being abated; a lessening, diminution, or reduction; a moderation; removal or putting an end to; the suppression.. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.