Sixty-four compact tractor terms defined in plain language, written for someone reading a spec sheet or a dealer quote for the first time. The glossary covers the power take-off and its two standard shaft speeds, the three-point hitch categories and the pin diameters that separate them, loader ratings and the three points at which they are measured, hydraulic flow and remote circuits, ballast and its effect on loader stability, transmission types, and the attachment classes this site tracks. Each entry gives a short definition suitable for scanning, a longer explanation of why the term matters when checking whether an implement fits, and links to the related terms it is usually confused with. Terms that appear in a compatibility verdict on this site are defined here, so any note the checker returns can be read without prior knowledge.