keyword 音标拼音: [k'iw
, ɚd]
关键词,关键字
关键词,关键字
keyword 关键字
keyword 关键字
Key \
Key \ (
k [=
e ]),
n . [
OE .
keye ,
key ,
kay ,
AS .
c [
ae ]
g .]
1 .
An instrument by means of which the bolt of a lock is shot or drawn ;
usually ,
a removable metal instrument fitted to the mechanism of a particular lock and operated by turning in its place .
[
1913 Webster ]
2 .
A small device which is inserted into a mechanism and turned like a key to fasten ,
adjust ,
or wind it ;
as ,
a watch key ;
a bed key ;
the winding key for a clock ,
etc .
[
1913 Webster ]
3 .
One of a set of small movable parts on an instrument or machine which ,
by being depressed ,
serves as the means of operating it ;
the complete set of keys is usually called the keyboard ;
as ,
the keys of a piano ,
an organ ,
an accordion ,
a computer keyboard ,
or of a typewriter .
The keys may operate parts of the instrument by a mechanical action ,
as on a piano ,
or by closing an electrical circuit ,
as on a computer keyboard .
See also senses 12 and 13 .
[
1913 Webster PJC ]
4 .
A position or condition which affords entrance ,
control ,
pr possession ,
etc .;
as ,
the key of a line of defense ;
the key of a country ;
the key of a political situation .
Hence ,
that which serves to unlock ,
open ,
discover ,
or solve something unknown or difficult ;
as ,
the key to a riddle ;
the key to a problem .
Similarly ,
see also senses 14 and 15 .
[
1913 Webster ]
Those who are accustomed to reason have got the true key of books . --
Locke .
[
1913 Webster ]
Who keeps the keys of all the creeds . --
Tennyson .
[
1913 Webster ]
5 .
That part of a mechanism which serves to lock up ,
make fast ,
or adjust to position .
[
1913 Webster ]
6 . (
Arch .)
(
a )
A piece of wood used as a wedge .
(
b )
The last board of a floor when laid down .
[
1913 Webster ]
7 . (
Masonry )
(
a )
A keystone .
(
b )
That part of the plastering which is forced through between the laths and holds the rest in place .
[
1913 Webster ]
8 . (
Mach .)
(
a )
A wedge to unite two or more pieces ,
or adjust their relative position ;
a cotter ;
a forelock .
See Illusts .
of {
Cotter },
and {
Gib }.
(
b )
A bar ,
pin or wedge ,
to secure a crank ,
pulley ,
coupling ,
etc .,
upon a shaft ,
and prevent relative turning ;
sometimes holding by friction alone ,
but more frequently by its resistance to shearing ,
being usually embedded partly in the shaft and partly in the crank ,
pulley ,
etc .
[
1913 Webster ]
9 . (
Bot .)
An indehiscent ,
one -
seeded fruit furnished with a wing ,
as the fruit of the ash and maple ;
a samara ; --
called also {
key fruit }.
[
1913 Webster ]
10 . (
Mus .)
(
a )
A family of tones whose regular members are called diatonic tones ,
and named key tone (
or tonic )
or one (
or eight ),
mediant or three ,
dominant or five ,
subdominant or four ,
submediant or six ,
supertonic or two ,
and subtonic or seven .
Chromatic tones are temporary members of a key ,
under such names as "
sharp four ," "
flat seven ,"
etc .
Scales and tunes of every variety are made from the tones of a key .
(
b )
The fundamental tone of a movement to which its modulations are referred ,
and with which it generally begins and ends ;
keynote .
[
1913 Webster ]
Both warbling of one song ,
both in one key .
--
Shak .
[
1913 Webster ]
11 .
Fig :
The general pitch or tone of a sentence or utterance .
[
1913 Webster ]
You fall at once into a lower key . --
Cowper .
[
1913 Webster ]
12 . (
Teleg .)
A metallic lever by which the circuit of the sending or transmitting part of a station equipment may be easily and rapidly opened and closed ;
as ,
a telegraph key .
[
Webster 1913 Suppl .]
13 .
any device for closing or opening an electric circuit ,
especially as part of a keyboard ,
as that used at a computer terminal or teletype terminal .
[
PJC ]
14 .
A simplified version or analysis which accompanies something as a clue to its explanation ,
a book or table containing the solutions to problems ,
ciphers ,
allegories ,
or the like ;
or (
Biol .)
a table or synopsis of conspicuous distinguishing characters of members of a taxonomic group .
[
Webster 1913 Suppl .]
15 . (
Computers )
A word or other combination of symbols which serves as an index identifying and pointing to a particular record ,
file ,
or location which can be retrieved and displayed by a computer program ;
as ,
a database using multi -
word keys .
When the key is a word ,
it is also called a {
keyword }.
[
PJC ]
{
Key bed }.
Same as {
Key seat }.
{
Key bolt },
a bolt which has a mortise near the end ,
and is secured by a cotter or wedge instead of a nut .
{
Key bugle }.
See {
Kent bugle }.
{
Key of a position }
or {
Key of a country .} (
Mil .)
See {
Key },
4 .
{
Key seat } (
Mach .),
a bed or groove to receive a key which prevents one part from turning on the other .
{
Key way },
a channel for a key ,
in the hole of a piece which is keyed to a shaft ;
an internal key seat ; --
called also {
key seat }.
{
Key wrench } (
Mach .),
an adjustable wrench in which the movable jaw is made fast by a key .
{
Power of the keys } (
Eccl .),
the authority claimed by the ministry in some Christian churches to administer the discipline of the church ,
and to grant or withhold its privileges ; --
so called from the declaration of Christ ,
"
I will give unto thee the keys of the kingdom of heaven ."
--
Matt .
xvi .
19 .
[
1913 Webster ]
keyword \
key "
word `\,
n .
A word used as an entry point into an index which serves to identify files ,
records ,
texts ,
or other data containing the keyword or some related word ,
such as a synonym .
It is a type of key [
15 ];
as ,
a boolean combination of keywords is more effective for information retrieval than a single key [
15 ].
[
PJC ]
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