| 释义 |
ex·ten·sion
I. \ikˈstenchən, ek-, in sense 3c “ or estäⁿsyōⁿ\ noun
(plural extensions \-ənz, -ōⁿ(z)\)
Usage: often attributive
Etymology: Middle English extensioun, from Middle French or Late Latin; Middle French extension, from Late Latin extension-, extensio, from Latin extensus + -ion-, -io -ion
1.
a. : the action of extending or state of being extended : a stretching out or stretching forth : a carrying forward : lengthening, furthering, developing
b. : the action of spreading out (as in area) or state of being spread out : expansion, enlargement, augmentation, increase
c. : something extended
2.
a. : the total range over which something extends or can be extended : compass
< the extension of the human mind >
b. : denotation 4
< plant is a word with wider extension than orchid >
— contrasted with intension
3.
a. : the stretching of a fractured or luxated limb so as to restore it to its natural position
b. : the straightening out of a flexed limb
c. : a dance movement in which the leg is extended at an angle to the body; also : an exercise (as for a ballet dancer) in which this movement is used
4.
a. : a property whereby something occupies or apparently occupies a greater or lesser part of space : spatial magnitude
b. : something marked or delimited by the property of extension
5. : an increase in length of time : increased or continued duration; specifically : an agreement on or concession of additional time (as for meeting an overdue debt or fulfilling a legal formality)
6. : the making available of the educational opportunities or other resources of an institution by special programs or methods (as evening classes in a university, off-campus instruction centers, correspondence courses, library branches, or bookmobiles) to persons otherwise unable to take advantage of such opportunities and resources; also : a service or system by which such opportunities or resources are made available
7.
a. : a part that is extended from or attached to a main body or section as an addition, supplement, or enlargement
< a house with two extensions >
or that is capable of being so extended or attached
< a table with side extensions >
: a section that forms an additional length
< an extension for an electric-light cord >
< the extension of a railway >
: prolongation; also : something having extensions (as a table)
b. : an extra telephone connected to the principal line
< they have a downstairs phone and an extension in each of the bedrooms >
8. : an indicated figure or amount: as
a. : a figure transferred or carried forward (as in bookkeeping)
b. : an amount computed (as by multiplying a number of units by the cost of each unit)
< extensions on an invoice >
II. noun
: a mathematical set (as a field or group) that includes a given and similar set as a subset |