praesenz (from German) [French: présence, from Latin: praesentia »present«]  

general: of the current time; in attendance, at hand.

psychology: state of awareness of the content of perception in the consciousness. The duration of the present is described as the few seconds during which the immediacy of time is experienced.

electroacoustics: the bringing forth of a region of frequency, eg. especially clear speech playback. Technically this is realised in the region from about 1 to 5 kHz.

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Présence: that is the thin layer of ice, upon which the foot can only so briefly weigh, until it breaks; but still, during this portion of a second in which the foot intends to come to rest, the ice, the thin sheet, breaks, and only the certainty of the pack ice remains: in advance of the view into the future, in which the certainty of the continually renewing present, the splitting of the layer of ice, and the absurdity, that lies in the constantly undertaken attempt, to find ones feet. So ‘présence’ appears as that present moment, that connects past and future with one another.

Bernd Alois Zimmermann — Présence, ballet blanc for violin, violoncello and piano

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It starts with repetition
Patricide without end
PRÉSENCE and its double.
A ‘théatre de la cruauté’
The non-presentable.
Ballet blanc.

Helmut Oehring and Iris ter Schiphorst — Prae-senz, ballet blanc II for violin, violoncello, prepared-piano and sampler