Semicolon
The definition of Semicolon:
It is a punctuation mark (;)used to separate a sentence into two independent part. Generally speaking, these two part can stand as sentenses when. [1]
The development of Semocolon
The first user was the Italian printer Aldus Manutius, the Elder. He used semicolon to separate words of oppisite meanings and to indicate interdependent statements. (Bhakti Satalkar)The semicolon was used from 1591 in the English language. Ben Jonson used it systematically and correctly. [2]
Semicolon Rules and Examples:
Rules for semicolon usage need to be well understood, and let me tell you several rules and it is better that we can understand and remember them.
Semicolon rule 1:
The first semicolon rule is to use a semicolon in a place where the conjunction has been omitted to separate two clauses or sentences.
Example:
u He went to the school; he forgot to take the textbook.
u She will come here tomorrow; he will reture the book to her.
Semicolon rule 2:
Semicolon can be used to separate a long list of items when the items have been separated by commas.
Example:
u To study Janpanese you need to remember vocabulary; listen to a lot of good Japanese listening materials that is suit to your level; practice speaking with Janpanese.
u The first prize was awarded to Jane Lloyd, Seattle; second prize to Thomas Fritz, Dallas; third prize to Chris Hook,California.//[2]//
Semicolon rule 3:Semicolon can be used before a conjunctive adverb to declear the relationship between two closely related sentences. The conjunctive adverbs are however, therefore, in addition, hence, subsequently, consequently and so on.
Example:
u The Company believes the abilities of its staff; therefore, employees from all the departments right to participate in the discussion and decision meeting.
Semicolon rule 4:Semicolon can be used before introductory adverbs.The introductory words are for example, for instance, etc. Using semicolon before introductory words help to keep the sentences connected and related to each other.
Example:
u I am very fond of Italian food; for example, spaghetti, pizza and calzones. [4]
Semicolon rule 5:
Using semicolon to separate indepent clauses joined by a conjunction. And each independent clauses contains a comma.
Example:
I got lost outside London this summer; I got yelled at by my wife, laughed at by my son, and chided by my colleagues. [4]
There are many other rules not mentioned above.
Reference:
  1. semicolon(sem·i·co·lon) ---- Oxford Dictionaries

2. Satalkar ,Bhakti (2010) Use of Semicolon

3. Lorcher ,Trent (2010)Lesson Plan: Using Semicolons

4.Satalkar ,Bhakti (2010)Semicolon Rules

See also:
See also:

1.Commas vs. Semicolons in Compound Sentences:

http://owl.english.purdue.edu/owl/resource/607/04/Dana Driscoll, Allen Brizee 04,17,2010 last edited

2.The Semicolon :

http://www.writingcentre.uottawa.ca/hypergrammar/semicoln.html