Op
A single tool-native command a target composes (long form: operation); the middle of the work hierarchy (Spell to Op to Target). Op in full.
Knowledge graph
The queryable graph of a workspace's spells, targets, docs, and code relationships; query it with magus query/explain/path. Knowledge graph in full.
Run
One target executing under one magus invocation, such as magus run test web or magus affected ci. A run keeps its captured output behind an output reference. Every magus run is a run whether or not any job asked for it; see Job for how the two relate. Run in full.
Chord
A key combination bound to a console command, written mod+k, where mod is Cmd on macOS and Ctrl elsewhere, so one binding fits both. Every chord is rebindable (Settings > Keybindings), and a command remains reachable from the command bar whether or not it has one. Chord in full.
Command bar
The console's runner: one searchable list of every command and its chord, opened with mod+k. It is the discoverable route to any action: the menus and chords dispatch the same commands it does. Command bar in full.