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 ?
"Whilst the tulip opened I wrote it myself, for I did not wish to lose a moment.
But after three hours the Marionette's eyes were still open, his mouth still shut and his legs kicked harder than ever.
I thought I was passing Deemer's store; it was open and lit up--that is what I thought; of course it is never open now.
They hurried on, and we followed them; until suddenly they set up a strange halloo, which was answered from beyond the grove through which we were passing, and the next moment we entered upon some open ground, at the extremity of which we descried a long, low hut, and in front of it were several young girls.
I had taken my place with Conseil in the saloon; through the open window we could see the lower beds of the Southern Ocean.
With a bound he crossed the room and attempted to open it; but to no avail.
The Russian had already drawn a pocketknife from his trousers, and was weakly attempting to open it.
Hester Dethridge dragged herself free from Anne, advanced, with her candle in her hand, and threw open Geoffrey's bedroom door; returned to the head of the stairs; and stood there, firm as a rock, waiting for him.
"What does that prove?" I rejoined with a good sense of which I was proud; "he might have opened the lock with his left hand, which would have been quite natural, his right hand being wounded."
Death of my life, sir,' returned the stranger, 'it's my character to be impatient!' The sound of Mistress Affery cautiously chaining the door before she opened it, caused them both to look that way.
A man standing at an open cottage door greeted me by name as I passed.
When they reached a certain spot these men appeared to be annihilated, one after the other, as if the earth had opened under their feet.