open

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open

1. Nautical free from navigational hazards, such as ice, sunken ships, etc.
2. Music
a. (of a violin or guitar string) not stopped with the finger
b. (of a pipe, such as an organ pipe) not closed at either end
c. (of a note) played on such a string or pipe
3. Commerce
a. in operation; active
b. unrestricted; unlimited
4. (of a wound) exposed to the air
5. (esp of the large intestine) free from obstruction
6. Chess (of a file) having no pawns on it
7. Maths (of a set) containing points whose neighbourhood consists of other points of the same set
8. Computing (of software or a computer system) designed to an internationally agreed standard in order to allow communication between computers, irrespective of size, maufacturer, etc.

open

[′ō·pən]
(electricity)
Condition in which conductors are separated so that current cannot pass.
Break or discontinuity in a circuit which can normally pass a current.

open

(1)
To prepare to read or write a file. This usually involves checking whether the file already exists and that the user has the necessary authorisation to read or write it. The result of a successful open is usually some kind of capability (e.g. a Unix file descriptor) - a token that the user passes back to the system in order to access the file without further checks and finally to close the file.

open

(2)
Abbreviation for "open (or left) parenthesis" - used when necessary to eliminate oral ambiguity. To read aloud the LISP form (DEFUN FOO (X) (PLUS X 1)) one might say: "Open defun foo, open eks close, open, plus eks one, close close."

open

(3)
Non-proprietary. An open standard is one which can be used without payment.

open

(1) To engage a file for reading and writing. Technically, an app is "run" and the data file is "opened." For example, after a word processing application is "loaded and run," a document is "opened" for editing or printing. Then, the document is "closed," and the app is "exited." Apps are also said to be "opened" and "closed."

In the case of a script or batch file, "open" can mean "open" for editing or "open and run." The difference is significant. Opening a batch file to edit its contents causes no action until the user makes changes, whereas opening and running a batch file causes instructions to be executed. Contrast with close.

(2) To "run" a program (application). "Open" is increasingly used to mean "load and run."

(3) With regard to a switch, open is "off." See switch.

(4) Made to operate or function compatibly with other products. See open architecture, open system and open source.
References in classic literature ?
I saw them quite hard at work, when I looked down through the open skylight.
Around him on the bier itself were laid some books, and several papers open and folded; and those who were looking on as well as those who were opening the grave and all the others who were there preserved a strange silence, until one of those who had borne the body said to another, "Observe carefully, Ambrosia if this is the place Chrysostom spoke of, since you are anxious that what he directed in his will should be so strictly complied with.
It was open, and led through a stone passage to a circular stairway, which went steeply down.
At last I pulled open a heavy door which stood ajar, and found myself in an old ruined chapel, which had evidently been used as a graveyard.
I could not say which, for eyes were open and stony, but without the glassiness of death,and the cheeks had the warmth of life through all their pallor.
After a pause of a moment, he proceeded, in his stately way, to the door, drew back the ponderous bolts, unhooked the heavy chains, and began to draw it open.
As the door began to open, the howling of the wolves without grew louder and angrier.
But still the door continued slowly to open, and only the Count's body stood in the gap.
There was a low, sweet ripple of laughter, and in a rage I threw open the door, and saw without the three terrible women licking their lips.
When I ran to push it open, I found that it was hopelessly fast.
I'll take the whip out, set up straight, an' drive fast; you hold your bo'quet in your lap, an' open your little red parasol, an' we'll jest make the natives stare
Maybe I'd be more genteel inside, and then I wouldn't have to be jumped down and my clothes fly up, but could open the door and step down like a lady passenger.