1.Chemistry . a substance that causes or accelerates a chemical reaction without itself being affected.
2.something that causes activity between two or more persons or forces without itself being affected.
3. a person or thing that precipitates an event or change: His imprisonment by the government served as the catalyst that helped transform social unrest into revolution.
4. a person whose talk, enthusiasm, or energy causes others to be more friendly, enthusiastic, or energetic.
1. to abstain from an impulse to say or do something
2.a phrase or verse recurring at intervals in a song or poem, especially at the end of each stanza; chorus.
a.a musical setting for the refrain of a poem.
c.the principal, recurrent section of a rondo.
1.of, pertaining to, or affected with lethargy; drowsy; sluggish.
2. lazy, indolent, torpid.
1.prophecy, prediction of events, noun;
2. the art, ability, or practice of foretelling events or interpreting omens
1. to coax or influence by gentle flattery; cajole
2.to use flattery or cajolery.
1.(of the elements) as if showing violent anger
1. a funeral song or tune, or one expressing mourning in commemoration of the dead.
2. any composition resembling such a song or tune in character, as a poem of lament for the dead or solemn, mournful music: Tennyson's dirge for the Duke of Wellington.
3. a mournful sound resembling a dirge: The autumn wind sang the dirge of summer.
4. Ecclesiastical . the office of the dead, or the funeral service as sung.
1. a stick with a pointed or electrically charged end, for driving cattle, oxen, etc.; prod.
2. anything that pricks or wounds like such a stick.
3. something that encourages, urges, or drives; a stimulus.
4. to prick or drive with, or as if with, a goad; prod; incite.
1.thin, tenuous, or rarefied, as a fluid or an odor.
2. fine or delicate in meaning or intent; difficult to perceive or understand: subtle irony.
3. delicate or faint and mysterious: a subtle smile.
4. requiring mental acuteness, penetration, or discernment: a subtle philosophy.
5. characterized by mental acuteness or penetration: a subtle understanding.
1. to cause or allow (a building, automobile, etc.) to fall into a state of disrepair, as by misuse or neglect (often used passively): The house had been dilapidated by neglect.
2. Archaic . to squander; waste.
3. to fall into ruin or decay.
1. to move or go forward or onward, especially after stopping.
2. to carry on or continue any action or process.
3. to go on to do something.
4. to continue one's discourse.
5. Law .
a. to begin and carry on a legal action.
b. to take legal action (usually followed by against ).
1. sharp or biting to the taste or smell; bitterly pungent; irritating to the eyes, nose, etc.: acrid smoke from burning rubber.
2. extremely or sharply stinging or bitter; exceedingly caustic: acrid remarks.
a feeling or impression that something is about to happen, especially something evil; foreboding.
to state or represent less strongly or strikingly than the facts would bear out; set forth in restrained, moderate, or weak terms:
recklessly or thoughtlessly bold; foolishly rash or venturesome.
1. a visible incorporeal spirit, especially one of a terrifying nature; ghost; phantom; apparition.
2. some object or source of terror or dread: the specter of disease or famine.
1. to eat or wear away gradually as if by gnawing, especially by chemical action.
2. to impair; deteriorate: Jealousy corroded his character.
1. having the power of producing; generative; creative: a productive effort.
2. producing readily or abundantly; fertile: a productive vineyard.
3.causing; bringing about (usually followed by of ): conditions productive of crime and sin.
4. Economics . producing or tending to produce goods and services having exchange value.
5. Grammar . (of derivational affixes or patterns) readily used in forming new words, as the suffix -ness.
a failure, defect, or deficiency in conduct, condition, thought, ability, etc.
verb (used with object)
1. to make young again; restore to youthful vigor, appearance, etc.: That vacation has certainly rejuvenated him.
2. to restore to a former state; make fresh or new again: to rejuvenate an old sofa.
3. Physical Geography .
a. to renew the activity, erosive power, etc., of (a stream) by uplift or by removal of a barrier in the stream bed.
b. to impress again the characters of youthful topography on (a region) by the action of rejuvenated streams.
verb (used without object)
4. to undergo rejuvenation; revive.
1. excessively proud of or concerned about one's own appearance, qualities, achievements, etc.; conceited: a vain dandy.
2. proceeding from or showing personal vanity: vain remarks.
3. ineffectual or unsuccessful; futile: a vain effort.
4. without real significance, value, or importance; baseless or worthless: vain pageantry; vain display.
5. Archaic . senseless or foolish.
6. in vain,
a. without effect or avail; to no purpose: to apologize in vain.
b. in an improper or irreverent manner: to take God's name in vain.
1. a complimentary performance of vocal or instrumental music in the open air at night, as by a lover under the window of his lady.
2. a piece of music suitable for such performance.
3. serenata ( def. 2 ) .
4.to entertain with or perform a serenade.
1.to discourage or restrain from acting or proceeding: The large dog deterred trespassers.
2.to prevent; check; arrest: timber treated with creosote to deter rot.
1. lacking in vigor or vitality; slack or slow: a languid manner.
2. lacking in spirit or interest; listless; indifferent.
3. drooping or flagging from weakness or fatigue; faint.
1. a physical weakness or ailment: the infirmities of age.
2. quality or state of being infirm; lack of strength.
3. a moral weakness or failing.