"aligner" means: Someone who has mastered the art of being on the same page with everyone — the person in a group who keeps things cohesive, smooths out disa.... This is a fairly neutral word with no inherent risk attached. There is no real cause for parental concern; it is descriptive vocabulary rather than something dangerous. If your child uses it, context will usually make the meaning clear. A brief, curious question about where they heard it is generally enough to know whether to follow up.