1
- the lowest part or edge of something, especially the part on which it rests or is supported基, 底：
she sat down at the base of a tree.
她在一个树桩边坐下。
1.1
- Architecture the part of a column between the shaft and pedestal or pavement【建筑】基底, 基座。
1.2
- Botany & Zoology the end at which a part or organ is attached to the trunk or main part【植, 动】基部; 连接处。
1.3
- Geometry a line or surface on which a figure is regarded as standing【几何】底边; 底面：
the base of the triangle.
这个三角形的底边。
1.4
- Surveying a known line used as a geometrical base for trigonometry【测绘】基线。
1.5
- Heraldry the lowest part of a shield【纹章】盾徽基部。
1.6
- Heraldry the lower third of the field【纹章】（底的）基带。
2
- a conceptual structure or entity on which something draws or depends基础：
the town's economic base collapsed.
这个城镇的经济基础崩溃了。
2.1
- something used as a foundation or starting point for further work基点, 起点：
she uses existing data as the base for the study.
她以现有信息作为研究的起点。
2.2
- with modifier a group of people regarded as supporting an organization, for example by buying its products（通过购买其产品等方式支持某机构的）基本群体：
a client base.
客户群。
3
- the main place where a person works or stays（工作或活动的）据点; 基地：
she makes the studio her base.
她把工作室作为她的基地。
3.1
- chiefly Military a place used as a centre of operations by the armed forces or others; headquarters【主军】根据地, 基地, 总部：
he headed back to base.
他折回总部去。
3.2
- a place from which a particular activity can be carried out基地：
a base for shipping operations.
水运业务基地。
4
- a main or important element or ingredient to which other things are added基本成分：
soaps with a vegetable oil base.
以植物油为基本成分的肥皂。
4.1
- mass noun a substance used as a foundation for make-up（化妆品）粉底。
4.2
- mass noun a substance into which a pigment is mixed to form paint, such as water, oil, or powdered aluminium hydroxide（油漆的）基（质）, 载色剂, 底层, 底涂。
5
- Chemistry a substance capable of reacting with an acid to form a salt and water, or (more broadly) of accepting or neutralizing hydrogen ions【化】碱。比较ALKALI.
5.1
- Biochemistry a purine or pyrimidine group in a nucleotide or nucleic acid【生化】碱基。
6
- Electronics the middle part of a bipolar transistor, separating the emitter from the collector【电子】（晶体管的）基极。
7
- Linguistics the root or stem of a word or a derivative【语言学】词根; 词基。
7.1
- the uninflected form of a verb动词原形。
8
- Mathematics a number used as the basis of a numeration scale【数】（数系的）基（数）。
8.1
- a number in terms of which other numbers are expressed as logarithms（对数的）底。
9
- Baseball one of the four stations that must be reached in turn to score a run【棒球】垒。
with obj.
1
- （常作be based）use something specified as the foundation or starting-point for (something)以某物作为…的基础（或出发点）：
the film is based on a novel by Pat Conroy
那部电影是以派特·康罗伊的一部小说为基础的
entitlement will be based on income.
津贴将以收入为基础。
2
- （一般作be based）situate at a specified place as the centre of operations将…的活动中心（或总部）设在某地：
the Science Policy Review Unit is based at the University of Sussex
科学策略审核单位的活动中心设在苏塞克斯大学
as adj., in combination based a London-based band.一支常驻伦敦的乐队。
短语
get to first base
- usu. with negative informal, chiefly N. Amer. achieve the first step towards one's objective〈非正式, 主北美〉迈出第一步。
off base
- informal, chiefly N. Amer. mistaken〈非正式, 主北美〉错误的。
touch base (with)
- informal, chiefly N. Amer. briefly make or renew contact (with)〈非正式, 主北美〉（与…）联系, 恢复联系。
词源
Middle English: from Old French， from Latin basis 'base， pedestal'， from Greek.
1
- (of a person or their actions or feelings) without moral principles; ignoble（人、行为或感情）卑鄙的, 卑劣的：
the electorate's baser instincts of greed and selfishness.
选民那贪婪自私的卑劣本性。
1.1
- archaic denoting or befitting a person of low social class〈古〉卑下的, 卑贱的。
1.2
- (of coins or other articles) not made of precious metal（硬币或其他物体）掺杂贱金属的; 成色低的。
派生词
basely
adverbbaseness
noun词源
late Middle English: from Old French bas, from medieval Latin bassus 'short' (found in classical Latin as a cognomen). Early senses included 'low， short' and 'of inferior quality'; from the latter arose a sense 'low in the social scale'， and hence （mid 16th cent.） 'reprehensibly cowardly， selfish， or mean'.