In General

Except for common Latin abbreviations, don’t use an abbreviation without first spelling it out.

Latin Abbreviations

Latin abbreviations are often misused by those unsure of their meaning. The two that are misused most often are e.g. and i.e. The abbreviation e.g. stands for exempli gratia, meaning for example. Set the example off with parentheses and put a comma after the unitalicized abbreviation. Many UO students major in one or more Romance languages (e.g., French, Italian, Spanish).

The abbreviation i.e. stands for id est, meaning that is (‘in other words’). Set the clarification off with parentheses and put a comma after the unitalicized abbreviation.

The University of Oregon Telephone Directory is provided free to UO employees (i.e., faculty members, officers of administration, classified staff members, and graduate employees).

The abbreviation etc. adds little of value. If the unlisted items denoted by etc. are not important enough to include, don’t bother using the abbreviation.

Submit a yellow printing-revision form to change such publication details as quantity, ink color, and paper stock.


Submit a yellow printing revision form to change quantity, ink color, paper stock, etc.

Two frequently used era designations are AD (anno Domini, ‘in the year of the Lord’) and BC (‘before Christ’). Both are set in small capital letters, and both use periods after each letter. Alternate era designations such as BCE (‘before the Common Era’) or CE (‘Common Era’) may be substituted as long as their use is consistent throughout the document.

Although BCE and CE both follow a year number, notice that a.d. appears before a year number and b.c. follows a year number.

300 BC


AD 1250

The abbreviation for the Latin term circa should follow the primary listing in The American Heritage Dictionary of the English Language, c.

Certificates and Degrees

See Academics.

Days of the Week or Months

Write out months or days of the week unless space is too limited.

The class meets Mondays, Wednesdays, and Fridays.


Mon., April 6 First class meeting
Tues., April 7 Midterm examination
Wed., April 8 Final examination

Days of the week can be abbreviated in course listings as follows:


Mailing Addresses

In mailing addresses, use the two-letter postal abbreviation for states. Except for the hyphenated nine-digit ZIP code, postal regulations require that no punctuation be used in the mailing address. Delivery of US mail to university offices requires the four-digit extended ZIP code before University of Oregon. Do not include building names and room numbers in mailing addresses.

On envelopes or mailing lists, write addresses in capital letters.

EUGENE OR 97403-1266

In standard running text, write the same mailing address as follows:

Office of Admissions, 1266 University of Oregon, Eugene OR 97403-1266.

Abbreviate compass directions in mailing addresses and in running text. One-letter compass directions require a period (N., W.); two-letter abbreviations (NW, SE) do not.


Use the following abbreviations with a mailing address that includes a street number. If an address number isn’t used, don’t abbreviate.

AVE Avenue
BLVD Boulevard

In references to street addresses in running text, spell out the standard abbreviations used in mailing addresses—Street, Avenue, Boulevard, Place, Court, Lane.

The Museum of Natural and Cultural History is located at 1680 East 15th Avenue, Eugene, Oregon.

General references to streets, roads, avenues, and places aren’t capitalized.

In Eugene, most numbered roadways are avenues. In Springfield, numbered roadways are usually either streets or places.

ZIP is an acronym for Zoning Improvement Plan, and should always be in capital letters.


Spell out terms of measurement in the text:

  • inches
  • miles
  • millimeters
  • minutes
  • kilometers
  • percent


Use Pac-12 as an abbreviation for the Pacific-12 Conference.


Use this abbreviation with a telephone number or address and a deadline to request a response. Please is redundant, because the abbreviation stands for the French répondez s’il vous plait, “please respond.”

If in doubt about whether your readers know the meaning of RSVP, use English: Please respond or Please reply.

State Names

Spell out state names unless space is restricted or when giving a mailing address. Use the two‑letter United States Postal Service abbreviations (e.g., OR) in mailing addresses; don’t insert a comma between the city and the state.

The university is located in Eugene, Oregon.


Direct related inquiries to the Office of Affirmative Action and Equal Opportunity, 474 Oregon Hall; send mail to 5221 University of Oregon, Eugene OR 97403-5221; telephone 541-346-3123, TTY 541-346-1021.

If space is limited in text other than a mailing address, use longer standard abbreviations with periods (e.g., Ore. or Oreg. for Oregon). A few states (e.g., Hawaii and Idaho) are never abbreviated in this way. Section 10.28 of The Chicago Manual of Style lists both types of abbreviations (e.g., Calif. and CA for California).

Subject Codes

Subject codes are fixed abbreviations for study areas; they appear in all-capital letters and without internal spaces. The UO Catalog has a list of subject codes.

  • BI (not Biol) biology
  • J (not JOUR) journalism
  • MATH (not Math) mathematics

Do not use the subject code as an abbreviation for the related department or program.


The correct abbreviation for morning times is a.m. The correct abbreviation for afternoon and evening times is p.m.

Use noon instead of 12:00 p.m.
Use midnight instead of 12:00 a.m.

The class meets at 10:30 a.m.
The lecture begins at 4:00 p.m. and the reception at 5:15.

There are several correct ways of expressing inclusive times. Don’t mix and match them.

The workshop lasted from 8:00 a.m. to 10:45 p.m.
Visiting hours are 8:00–10:00 a.m.
The museum is open between noon and 5:00 p.m.


The workshop lasted from 8:00 a.m.–10:45 p.m.
Visiting hours are between 8:00–10:00 a.m.

Workshop 10:30 a.m. –noon
Lunch noon–1:30 p.m.
Reception 6:30–7:30 p.m.

The 24-hour clock is used in the online University of Oregon Schedule of Classes. For example, the class schedule uses 08:00 for 8:00 a.m. and 16:30 for 4:30 p.m.

University of Oregon

Spell out the first reference to the University of Oregon. Use the UO, Oregon, or the university to abbreviate subsequent references.