Definition

Adjective: - Lasting for a very short time; extremely brief. This word describes something that exists, occurs, or is experienced for only an instant.

Usage

The word "momentaneous" is a formal and somewhat technical adjective. It is used to emphasize the extremely short, almost instantaneous, duration of an event, action, or state. It is often interchangeable with "momentary," but can carry a stronger connotation of brevity.

Examples

• The camera captured a momentaneous flash of light in the distant sky.
• There was a momentaneous pause in the conversation before everyone burst into laughter.
• The feeling of recognition was momentaneous, gone before she could fully grasp it.

Advanced Usage

• In Scientific or Technical Contexts: Used to describe phenomena or measurements of instantaneous value.
  • The sensor is designed to detect momentaneous changes in pressure.

Variants and Related Words

• Momentarily (adverb): For a very short time; very soon.
  • The power was lost momentarily.
• Momentary (adjective): Lasting for a very short time. (This is the more common synonym).
  • a momentary delay

Synonyms

• Fleeting
• Transient
• Ephemeral
• Brief
• Instantaneous

Antonyms

• Permanent
• Lasting
• Enduring
• Prolonged

Notes

"Momentaneous" is less frequently used in everyday modern English than its synonym "momentary." It is primarily found in more academic, literary, or technical writing. The provided reference context correctly groups it with words like "fleeting," "fugitive," and "momentary" to describe things of markedly brief duration.

Adjective

1. lasting for a markedly brief time
   • a fleeting glance
   • fugitive hours
   • rapid momentaneous association of things that meet and pass
   • a momentary glimpse