One who aligns or arranges things; a tool used for aligning.
From 'aline' (to align) + '-er' (one who does). This agent noun follows standard English word-formation patterns and appears in technical contexts.
In manufacturing and construction, an 'aliner' might be a precision tool, a person, or even software—the suffix '-er' is so flexible it can mean the doer, the tool, or even the expert!
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