delta 音标拼音: [d'ɛltə]
n . 三角州,希腊字母的第四个字
三角州,希腊字母的第四个字
delta 增量 差量
delta n 1 :
a low triangular area of alluvial deposits where a river divides before entering a larger body of water ; "
the Mississippi River delta "; "
the Nile delta "
2 :
an object shaped like an equilateral triangle 3 :
the 4th letter of the Greek alphabet Delta \
Del "
ta \,
n .;
pl . {
Deltas }. [
Gr .
de `
lta ,
the name of the fourth letter of the Greek alphabet (
the capital form of which is [
Delta ],
Eng .
D ),
from the Ph [
oe ]
nician name of the corresponding letter .
The Greeks called the alluvial deposit at the mouth of the Nile ,
from its shape ,
the Delta of the Nile .]
1 .
The fourth letter of the Greek alphabet ([
Delta ] [
delta ]),
corresponding to {
D }.
Hence ,
an object having the shape of the capital [
Delta ].
[
Webster 1913 Suppl .]
2 .
A tract of land shaped like the letter delta ([
Delta ]),
especially when the land is alluvial and inclosed between two or more mouths of a river ;
as ,
the delta of the Ganges ,
of the Nile ,
or of the Mississippi .
[
1913 Webster ]
3 . (
Elec .)
The closed figure produced by connecting three coils or circuits successively ,
end for end ,
esp .
in a three -
phase system ; --
often used attributively ,
as delta winding ,
delta connection (
which see ),
etc .
[
Webster 1913 Suppl .]
92 Moby Thesaurus words for "
delta ":
V ,
alkali flat ,
alluvial plain ,
basin ,
bill ,
bottomland ,
branch ,
breakwater ,
bushveld ,
campo ,
cape ,
champaign ,
champaign country ,
chersonese ,
coastal plain ,
coral reef ,
crotch ,
crutch ,
desert ,
down ,
downs ,
fan ,
fell ,
flat ,
flat country ,
flatland ,
flats ,
foreland ,
fork ,
furcula ,
furculum ,
grass veld ,
grassland ,
groin ,
head ,
headland ,
heath ,
hook ,
inguen ,
lande ,
level ,
llano ,
lowland ,
lowlands ,
lunar mare ,
mare ,
mesa ,
mesilla ,
moor ,
moorland ,
mull ,
naze ,
ness ,
offshoot ,
open country ,
pampa ,
pampas ,
peneplain ,
peninsula ,
plain ,
plains ,
plateau ,
playa ,
point ,
prairie ,
promontory ,
prong ,
ramification ,
reef ,
salt flat ,
salt marsh ,
salt pan ,
sandspit ,
savanna ,
sebkha ,
spit ,
spur ,
stem ,
steppe ,
table ,
tableland ,
tongue ,
tree veld ,
trident ,
tundra ,
upland ,
vega ,
veld ,
weald ,
wide -
open spaces ,
wishbone ,
wold 1 .
A quantitative change ,
especially a small or incremental
one (
this use is general in physics and engineering ). "
I just
doubled the speed of my program !" "
What was the delta on
program size ?" "
About 30 percent ." (
He doubled the speed of
his program ,
but increased its size by only 30 percent .)
2 . [
Unix ]
A {
diff },
especially a {
diff }
stored under the set
of version -
control tools called SCCS (
Source Code Control
System )
or RCS (
Revision Control System ).
See {
change
management }.
3 .
A small quantity ,
but not as small as {
epsilon }.
The
jargon usage of {
delta }
and {
epsilon }
stems from the
traditional use of these letters in mathematics for very small
numerical quantities ,
particularly in "
epsilon -
delta "
proofs
in limit theory (
as in the differential calculus ).
The term
{
delta }
is often used ,
once {
epsilon }
has been mentioned ,
to
mean a quantity that is slightly bigger than {
epsilon }
but
still very small . "
The cost isn '
t epsilon ,
but it '
s delta "
means that the cost isn '
t totally negligible ,
but it is
nevertheless very small .
Common constructions include "
within
delta of ---", "
within epsilon of ---":
that is , "
close to "
and "
even closer to ".
[{
Jargon File }]
(
2000 -
08 -
02 )
Developing European Learning through Technology Advance delta :
n .
1 . [
techspeak ]
A quantitative change ,
especially a small or incremental one (
this use is general in physics and engineering ). “
I just doubled the speed of my program !” “
What was the delta on program size ?” “
About 30 percent .” (
He doubled the speed of his program ,
but increased its size by only 30 percent .)
Delta ,
CO --
U .
S .
city in Colorado Population (
2000 ):
6400 Housing Units (
2000 ):
2749 Land area (
2000 ):
5 .
318651 sq .
miles (
13 .
775241 sq .
km )
Water area (
2000 ):
0 .
201126 sq .
miles (
0 .
520914 sq .
km )
Total area (
2000 ):
5 .
519777 sq .
miles (
14 .
296155 sq .
km )
FIPS code :
19850 Located within :
Colorado (
CO ),
FIPS 08 Location :
38 .
740879 N ,
108 .
063423 W ZIP Codes (
1990 ):
81416 Note :
some ZIP codes may be omitted esp .
for suburbs .
Headwords :
Delta ,
CO Delta
Delta ,
OH --
U .
S .
village in Ohio Population (
2000 ):
2930 Housing Units (
2000 ):
1193 Land area (
2000 ):
2 .
600604 sq .
miles (
6 .
735532 sq .
km )
Water area (
2000 ):
0 .
000000 sq .
miles (
0 .
000000 sq .
km )
Total area (
2000 ):
2 .
600604 sq .
miles (
6 .
735532 sq .
km )
FIPS code :
21616 Located within :
Ohio (
OH ),
FIPS 39 Location :
41 .
575090 N ,
84 .
002477 W ZIP Codes (
1990 ):
43515 Note :
some ZIP codes may be omitted esp .
for suburbs .
Headwords :
Delta ,
OH Delta
Delta ,
PA --
U .
S .
borough in Pennsylvania Population (
2000 ):
741 Housing Units (
2000 ):
324 Land area (
2000 ):
0 .
266230 sq .
miles (
0 .
689533 sq .
km )
Water area (
2000 ):
0 .
000000 sq .
miles (
0 .
000000 sq .
km )
Total area (
2000 ):
0 .
266230 sq .
miles (
0 .
689533 sq .
km )
FIPS code :
18800 Located within :
Pennsylvania (
PA ),
FIPS 42 Location :
39 .
727207 N ,
76 .
325668 W ZIP Codes (
1990 ):
17314 Note :
some ZIP codes may be omitted esp .
for suburbs .
Headwords :
Delta ,
PA Delta
Delta ,
IA --
U .
S .
city in Iowa Population (
2000 ):
410 Housing Units (
2000 ):
191 Land area (
2000 ):
0 .
998534 sq .
miles (
2 .
586190 sq .
km )
Water area (
2000 ):
0 .
000000 sq .
miles (
0 .
000000 sq .
km )
Total area (
2000 ):
0 .
998534 sq .
miles (
2 .
586190 sq .
km )
FIPS code :
19855 Located within :
Iowa (
IA ),
FIPS 19 Location :
41 .
324112 N ,
92 .
329481 W ZIP Codes (
1990 ):
52550 Note :
some ZIP codes may be omitted esp .
for suburbs .
Headwords :
Delta ,
IA Delta
Delta ,
LA --
U .
S .
village in Louisiana Population (
2000 ):
239 Housing Units (
2000 ):
111 Land area (
2000 ):
2 .
978267 sq .
miles (
7 .
713676 sq .
km )
Water area (
2000 ):
0 .
145765 sq .
miles (
0 .
377530 sq .
km )
Total area (
2000 ):
3 .
124032 sq .
miles (
8 .
091206 sq .
km )
FIPS code :
20330 Located within :
Louisiana (
LA ),
FIPS 22 Location :
32 .
321342 N ,
90 .
936544 W ZIP Codes (
1990 ):
Note :
some ZIP codes may be omitted esp .
for suburbs .
Headwords :
Delta ,
LA Delta
Delta ,
UT --
U .
S .
city in Utah Population (
2000 ):
3209 Housing Units (
2000 ):
1106 Land area (
2000 ):
3 .
151247 sq .
miles (
8 .
161691 sq .
km )
Water area (
2000 ):
0 .
000000 sq .
miles (
0 .
000000 sq .
km )
Total area (
2000 ):
3 .
151247 sq .
miles (
8 .
161691 sq .
km )
FIPS code :
18910 Located within :
Utah (
UT ),
FIPS 49 Location :
39 .
353145 N ,
112 .
573656 W ZIP Codes (
1990 ):
84624 Note :
some ZIP codes may be omitted esp .
for suburbs .
Headwords :
Delta ,
UT Delta
Delta ,
MO --
U .
S .
city in Missouri Population (
2000 ):
517 Housing Units (
2000 ):
222 Land area (
2000 ):
0 .
440008 sq .
miles (
1 .
139616 sq .
km )
Water area (
2000 ):
0 .
000000 sq .
miles (
0 .
000000 sq .
km )
Total area (
2000 ):
0 .
440008 sq .
miles (
1 .
139616 sq .
km )
FIPS code :
19072 Located within :
Missouri (
MO ),
FIPS 29 Location :
37 .
197371 N ,
89 .
738757 W ZIP Codes (
1990 ):
63744 Note :
some ZIP codes may be omitted esp .
for suburbs .
Headwords :
Delta ,
MO Delta
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