Definition

Adverb: - For the most part; chiefly; primarily: Used to indicate that something is true in most cases or is the most important part or aspect.

Usage and Examples

• Adverb:
  • The book is principally concerned with environmental issues. (The book deals mostly with environmental issues.)
  • The funding will be used principally for research and development. (The funding will be used mainly for research and development.)
  • He is principally known for his work in theoretical physics. (He is chiefly known for his work in theoretical physics.)

Advanced Usage

• "Principally" is often used in formal or academic writing to specify the primary focus, reason, or component.
  • The decision was based principally on economic factors.
• It can be used to contrast a main point with secondary ones.
  • The company operates principally in Asia, but also has a small presence in Europe.

Variants and Related Words

• Principal (adjective): First in order of importance; main.
  • The principal reason for his success is hard work.
• Principle (noun): A fundamental truth or proposition that serves as the foundation for a system of belief or behavior.
  • He is a man of strong moral principles.
  • (Note: "Principle" is a different word with a different meaning, but it is a common source of confusion with "principal/principally".)

Synonyms

• Mainly
• Chiefly
• Primarily
• Mostly
• Predominantly

Antonyms

• Secondarily
• Subordinately
• Incidentally

Notes on Usage

• "Principally" vs. "Primarily": These are often interchangeable. However, "principally" can sometimes emphasize the fundamental or first-order importance, while "primarily" can emphasize the first in a sequence or the most basic reason.
• Position in a Sentence: "Principally" often appears before the main verb or after the verb "to be."
  • They principally invest in technology stocks.
  • The problem is principally one of communication.

Adverb

1. for the most part
   • he is mainly interested in butterflies