(music) a mode whose scale is the same as a major key with the fourth scale degree raised by one half step, with the interval pattern:

(music) A mode whose scale is the same as a minor key with the second scale degree lowered by one half step, with the interval pattern (semitone - tone - tone - semitone - tone - tone - tone).

(programming) The mode of a compiler or IDE that allows for debugging, with the availability of information such as variable names and line numbers from the source code.

(programming) The mode of the compiler where the code is compiled for the end user, most often with optimisations.

(Internet) A technique used by some web browsers to maintain backward compatibility with older web pages that do not comply with modern standards. When such a page is detected, it is rendered in the older, non-standard way.

(attributive) brightness mode: a common kind of two-dimensional ultrasound image / (attributive) A divergence-free, curl-only polarization signal in the cosmic microwave background radiation.

(slang, sports, video games) A high level of performance.

A mode of an oscillating system in which all parts of the system move sinusoidally with the same frequency and with a fixed phase relation. The motion described by the normal modes is called resonance.

(grammar) The subjunctive mood.

(grammar) The subjunctive mood.