Definition

1. Verb:
   • To oscillate or swing, especially before coming to rest: To move back and forth with a regular or diminishing motion, like a pendulum.
   • (Archaic) To balance or weigh: To determine the weight of something; to be in equilibrium.

Usage Examples

• Verb (To oscillate):
  • The chandelier began to librate gently after being bumped.
  • The children's swing librated in the breeze.
• Verb (Archaic: to weigh/balance):
  • The ancient scales librated the gold with great precision. (This usage is now rare.)

Advanced Usage

• Scientific/Technical Context: In physics, "librate" can describe the oscillatory motion of a body, such as a pendulum or a celestial body in orbital mechanics (e.g., lunar libration).
  • The moon appears to librate, allowing us to see slightly more than half of its surface over time.
• Figurative Use: To waver or be poised between alternatives.
  • His opinion seemed to librate between approval and strong dissent.

Variants and Related Words

• Libration (n): The act or state of librating; an oscillatory motion.
  • The libration of the pendulum was measured.
• Libratory (adj): Of or pertaining to libration.
  • The device exhibited a libratory motion.

Synonyms

• Oscillate: To swing or move regularly back and forth.
• Swing: To move back and forth suspended or on an axis.
• Vacillate: To waver between different opinions or actions (figurative synonym for the wavering sense).
• Weigh (for the archaic sense): To measure the weight of.

Phrasal Verbs

(This word does not commonly form phrasal verbs.)

Related Idioms

(There are no common idioms directly using the word "librate.")

Verb

1. vibrate before coming to a total rest
   • the children's swing librated
2. determine the weight of
   • The butcher weighed the chicken