Definition

1. Adverb:

   • Common Era: Used to denote dates in the same calendar system as Anno Domini (AD), but without religious connotations. It is often preferred in academic and secular contexts.

2. Noun:

   • Cerium: A chemical element (symbol Ce) with atomic number 58. It is a soft, ductile, silvery metal belonging to the lanthanide series (rare-earth elements).

Usage Examples

• Adverb:

  • The manuscript is dated to the 5th century CE.
  • Many historical events are now commonly referenced using BCE and CE.

• Noun:

  • The alloy contained a small amount of ce to improve its properties.
  • Ce is used in the production of catalytic converters.

Advanced Usage

• In historical dating: "CE" is paired with "BCE" (Before Common Era) as a secular alternative to the BC/AD system.

  • The war took place in 331 BCE, and the empire was consolidated by 320 CE.

• In scientific contexts: As a noun, "Ce" often appears in chemical formulas, material science, and engineering discussions.

  • The compound CeO₂, cerium(IV) oxide, is an important polishing agent.

Variants and Related Words

• BCE (abbreviation): Before Common Era. The counterpart to CE for dates before year 1.
• Cerium (n): The full name for the element Ce.
• Lanthanide (n): The series of chemical elements to which cerium belongs.

Synonyms

• Adverb: Common Era (full form).
• Noun: Cerium (full name), Element 58.

Important Notes

• Capitalization: The abbreviation "CE" is typically written in capital letters.
• Punctuation: It is standard to write it without periods (i.e., "CE," not "C.E.").
• Context is Key: The meaning is entirely dependent on context. In a historical paper, "CE" is almost certainly the adverb. In a chemistry text, it is the chemical symbol.

Adverb

1. of the period coinciding with the Christian era; preferred by some writers who are not Christians
   • in 200 CE

Noun

1. a ductile grey metallic element of the lanthanide series; used in lighter flints; the most abundant of the rare-earth group