umbral

adj. pertaining to a dark shadow; of shade

Umbral is derived from the Latin umbra, meaning "shadow". It is also the Spanish word for "threshold", and sometimes used as a surname in that language.Umbral may refer to:Umbral calculusUmbraFrancisco UmbralUmbra (World of Darkness)
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n. threshold, sill

n. door post, side post

= threshold, band.
Ex: But documents with the following terms assigned would be rejected on the grounds that their combined weights did not exceed the pre-selected threshold.
Ex: In recent years a band of disciples has grown up in India, and has contributed to the revision and expansion of the schedules.
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* en el umbral de = on the threshold of.
* pisar el umbral = cross + the threshold of.
* umbral de la puerta = doorstep.
* umbral de referencia conjunta = cocitation threshold.
* umbral de rentabilidad = break-even, break-even point.