regular

normal, ordinary, regular, natural, typical

这些形容词均含“规则的、正常的、正规的”之意。
normal: 指不超过某种限度、符合某种标准或常规。
ordinary: 强调一般性和普通性，含不突出的意味。
regular: 指按已有模式的、有规律或定期的。
natural: 侧重某人或某物的行为符合其固有特性。
typical: 指个体能体现出群体的特征。

usual, customary, habitual, conventional, regular

这些形容词均有“通常的，惯常的”之意。
usual: 普通用词，概念广泛。指经常发生或意料中的事，既可指自然发生的现象，也可指按个人习惯或惯例而做的事。
customary: 指特定的个人或群体的平常习惯，或习俗性的行为。
habitual: 指按个人习惯反复发生的事情。侧重经常性、习惯性。
conventional: 语气强，指遵守已成习惯的事情，强调符合惯例，由人们普遍认可。
regular: 着重遵守约定俗成的规则。

名词 regular:

1. a regular patron
   同义词：habitue, fixture
2. a soldier in the regular army
3. a dependable follower (especially in party politics)
4. a garment size for persons of average height and weight

形容词 regular:

1. in accordance with fixed order or procedure or principle
2. often used as intensifiers
   同义词：veritable
3. conforming to a standard or pattern
4. (of solids) having clear dimensions that can be measured; volume can be determined with a suitable geometric formula
5. regularly scheduled for fixed times
6. in accord with regular practice or procedure
7. occurring at fixed intervals
   同义词：even
8. relating to a person who does something regularly
   同义词：steady
9. (used of the military) belonging to or engaged in by legitimate army forces
10. not constipated
    同义词：unconstipated
11. symmetrically arranged
    同义词：even
12. not deviating from what is normal
13. officially full-time

1. His pulse is not very regular.
   他的脉搏不很规则。
2. I am a regular reader of this newspaper.
   我是这份报纸的长期读者。
3. He has very regular features.
   他五官端正。
4. A cube is a regular solid.
   立方体是正多面体。

reg.u.lar

adj.Abbr. reg.（形容词）缩写 reg.
Customary, usual, or normal:
平常的，惯例的：习惯性的、通常的或正常的：
例句：
the train`s regular schedule.
火车正常的时间表

Orderly, even, or symmetrical:
规则的：有秩序的、均匀的或对称的：
例句：
regular teeth.
匀称的牙齿

In conformity with a fixed procedure, principle, or discipline.
有原则的：符合固定程序、规则或纪律的
Well-ordered; methodical:
规律的，有秩序的：秩序良好的；有条理的：
例句：
regular habits.
有规律的习惯

Occurring at fixed intervals; periodic:
定期的：按固定的间隔发生的；阶段性的：
例句：
regular payments.See Synonyms at normal
定期付款参见 normal

Occurring with normal or healthy frequency.
正常频率的：按正常或健康的频率发生的
Having bowel movements or menstrual periods with normal or healthy frequency.
恒常的：具有正常或健康的频率的肠胃运动或月经周期的
Not varying; constant.
不变的：不经常变化的；经常的
Formally correct; proper.
适当的；合适的
Having the required qualifications for an occupation:
合格的：拥有必要的职业资格的：
例句：
not a regular lawyer.
不是一个合格的律师

Informal Complete; thorough:
【非正式用语】 完全的；彻底的：
例句：
a regular scoundrel.
十足的恶棍

Informal Good; nice:
【非正式用语】 好的；友善的：
例句：
a regular guy.
不错的家伙

Botany Having symmetrically arranged parts of similar size and shape:
【植物学】 对称的：具有相似大小和形状的呈对称排列的部分的：
例句：
regular flowers.
对称的花

Grammar Conforming to the usual pattern of inflection, derivation, or word formation.
【语法】 规则变化的：符合词尾变化、衍生词及构词正常规则的
Ecclesiastical Belonging to a religious order and bound by its rules:
【基督教会】 受教规约束的：属于一个教派并受其教规约束的：
例句：
the regular clergy.
受教规约束的神职人员

Mathematics
【数学】
Having equal sides and equal angles. Used of polygons.
等边等角的：具有等边等角的。用于多边形
Having faces that are congruent regular polygons and congruent polyhedral angles. Used of polyhedrons.
全等的：每个面都是全等正多角形和全等多面角的。用于多面体
Belonging to or constituting the permanent army of a nation.
正规军的：属于或构成一个国家的常备军的
n.（名词）
Ecclesiastical A member of the clergy or of a religious order.
【基督教会】 修道士：神职人员或一个宗教级别的成员
A soldier belonging to a regular army.
正规军士兵
A dependable, loyal person:
忠诚的人：可靠、忠诚的人：
例句：
one of the party regulars.
一名忠诚的党员

A clothing size designed for persons of average height.
一般的尺寸：适合平均身高人穿的衣服尺寸
A habitual customer.
常客

来源：
Middle English reguler [living under religious rule]
中古英语 reguler [在宗教制度下生活的]
from Old French
源自 古法语
from Late Latin rôgul3ris [according to rule]
源自 后期拉丁语 rôgul3ris [依照制度]
from Latin rôgula [rod, rule] * see reg-
源自 拉丁语 rôgula [木棒，尺子] *参见 reg-

【引伸】
reg.ular.ity
reg.ularly
adv.（副词）