I've heard older hams talk about "aligning" their equipment. E.g. "I sent it to a guy for alignment" or "that rig probably needs to be completely aligned before you use it".
As a kid, sometimes I remember broadcast AM/FM receiver dial indicators would get "stuck" and you'd have to fuss with the knob, like crank it all the way one direction for a while, to get it to properly line up with the rough tuning labels again.
Is "alignment" basically that only on a more precise VFO indicator? Or does it involve more tuning elsewhere, say re-adjusting to factory biases via trimpots? Or is it not really a physical adjustment thing at all, more like checking capacitors or replacing tubes?