overcast

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overcast

1. Meteorol (of the sky) more than 95 per cent cloud-covered
2. Meteorol the state of the sky when more than 95 per cent of it is cloud-covered
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

overcast

[′ō·vər‚kast]
(meteorology)
Pertaining to a sky cover of 1.0 (95% or more) when at least a portion of this amount is attributable to clouds or obscuring phenomena aloft, that is, when the total sky cover is not due entirely to surface-based obscuring phenomena.
Cloud layer that covers most or all of the sky; generally, a widespread layer of clouds such as that which is considered typical of a warm front.
(mining engineering)
An enclosed airway to permit one air current to pass over another without interruption.
To move overburden removed from coal mined from surface mines to an area from which the coal has been mined.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

overcast (OVC)

As it relates to the cloud amount, it means 8 octas (8/8) of clouds, and the sky is totally covered with clouds. See cloud amount.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in classic literature ?
The sky was overcast, and, as they drove along the bank of the Coquille River, the fog suddenly enveloped them.
With this view he gave his unoccupied hand to Nell, and bidding her be of good cheer as they would soon be at the end of their journey for that night, and stimulating the old man with a similar assurance, led them at a pretty swift pace towards their destination, which he was the less unwilling to make for, as the moon was now overcast and the clouds were threatening rain.
Presently the sky became overcast, and the captain came aft looking uneasy.
For, if you observed, he rose in his stirrups, as thereby meaning to overcast the mark; and so he would have done, but Fangs happening to bound up at the very moment, received a scratch, which I will be bound to heal with a penny's breadth of tar.''