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English 222: Technical Writing — Guidelines: Writing Effective Definitions

Basic Definition Types

Parenthetical Definition–occurs in text; brief; provides just enough information to help the read understand the term and continue reading

  • He was playing a mandolin (a musical instrument).

Glossary–stands alone, often in the margin, linked to a pop-up window, or in a dictionary; provides greater detail to help a person understand specifically what the term means

  • A mandolin is a stringed musical instrument, similar to a guitar, with a hollow, shell-shaped base, four strings, and a curved neck.

Elaborated–complex definition, using illustrations and multiple examples and descriptions; this is an encyclopedic definition aimed at helping a reader understand the full concept behind a term; elaborated definitions can be several pages long

  • See mandolin patent example

Definition Writing Process

  1. Categorize item
  • That vehicle is a boat.
  • That vehicle is a canoe.
     
  • AIDS is a disease.
  • AIDS is a syndrome.
  1. Describe basic properties.
  • A thermometer is a measuring device.
  • A ruler is a measuring device.
  • A beaker is a measuring device.
     
  • A thermometer is a device for measuring temperature.
  • That vehicle is a boat.
  • That vehicle is a canoe.
  • That vehicle is a birch-bark canoe.
  1. Eliminate subjective language.
  • Dynamite is a terrorist tool.
  • Dynamite is an incendiary tool.
     
  • Plutonium is a weapon of mass destruction.
  • Plutonium is a component for generating energy.
  1. Eliminate circular reasoning.
  • A required course is a subject that is required.
  • A required course is a subject whose study is required for graduation.
  • A required course is a subject whose study is needed for graduation.
  • A required course is a subject whose study is mandatory for graduation.
     
  • Computer science is a major which involves programming computers.
  • Computer science is a major which involves programming advanced adding machines.

Basic Definition Pattern

Term Category Properties
term is a Y category with properties A, B, and C.
IUP is a college

is a university

is a doctoral one university

of medium size, funded by the state government, and offering both undergraduate and graduate degrees.
Research is a painful process

is an academic task

involving locating information about a specific topic in journal articles and other sources.
A disk is a computer device

is a storage device

is a data storage device

made of hard plastic and aluminum usually 1 1/4 inches in size.