Meaning: Something that is accepted as true without proof.

Part of speech: noun

Example: Her assumption was incorrect.

Category: Logic

Synonyms:

• premise
• supposition

Antonyms:

• fact
• certainty

Meaning: A positive declaration intended to give confidence.

Part of speech: noun

Example: He gave her his assurance that everything would be fine.

Category: Business

Synonyms:

• guarantee
• promise

Antonyms:

• doubt
• uncertainty

Meaning: To tell someone something positively to dispel any doubts.

Part of speech: verb

Example: I assure you that it will be done.

Category: Business

Synonyms:

• guarantee
• promise

Antonyms:

• doubt
• mislead

Meaning: Confident and certain.

Part of speech: adjective

Example: She spoke in an assured manner.

Category: Psychology

Synonyms:

• confident
• certain

Antonyms:

• uncertain
• doubtful

Meaning: In a way that is confident and certain.

Part of speech: adverb

Example: He will assuredly succeed in his endeavors.

Category: Language

Synonyms:

• certainly
• definitely

Antonyms:

• doubtfully
• uncertainly

Meaning: An acronym for 'American Standard Time'.

Part of speech: noun

Example: The meeting is scheduled for 3 PM AST.

Category: Time

Meaning: A radioactive element with the symbol At.

Part of speech: noun

Example: Astatine is rarely found in nature.

Category: Science › Chemistry

Synonyms:

• element
• chemical

Meaning: A type of flowering plant.

Part of speech: noun

Example: The aster blooms in late summer.

Category: Nature › Botany

Synonyms:

• flower
• plant

Meaning: A symbol (*) used to indicate a footnote or annotation.

Part of speech: noun

Example: Please refer to the asterisk for more information.

Category: Language

Synonyms:

• star
• symbol

Meaning: Towards the rear of a ship.

Part of speech: adverb

Example: The lifeboats are located astern.

Category: Navigation

Synonyms:

• backward
• behind

Meaning: A small rocky body orbiting the sun.

Part of speech: noun

Example: The asteroid passed close to Earth.

Category: Science › Astronomy

Synonyms:

• planetoid
• minor planet

Meaning: A respiratory condition causing difficulty in breathing.

Part of speech: noun

Example: He has asthma and uses an inhaler.

Category: Medicine › Health

Synonyms:

• respiratory condition
• breathing difficulty

Meaning: Relating to or suffering from asthma.

Part of speech: adjective

Example: She has asthmatic symptoms during the winter.

Category: Medicine › Health

Synonyms:

• respiratory
• breathing-related

Meaning: A sparkling wine from the Asti region of Italy.

Part of speech: noun

Example: We celebrated with a bottle of Asti Spumante.

Category: Food › Beverages

Synonyms:

• sparkling wine
• champagne

Meaning: A condition of the eye causing blurred vision.

Part of speech: noun

Example: He was diagnosed with astigmatism.

Category: Medicine › Health

Synonyms:

• vision defect
• eye condition

Meaning: To surprise someone greatly.

Part of speech: verb

Example: The magician's trick will astonish the audience.

Category: Arts

Synonyms:

• surprise
• amaze

Antonyms:

• bore
• unimpress

Meaning: Very surprised or shocked.

Part of speech: adjective

Example: She was astonished by the news.

Category: Arts

Synonyms:

• amazed
• surprised

Antonyms:

• unimpressed
• bored

Meaning: Causing great surprise or wonder.

Part of speech: adjective

Example: The results were astonishing.

Category: Arts

Synonyms:

• amazing
• incredible

Antonyms:

• ordinary
• unremarkable

Meaning: A feeling of great surprise.

Part of speech: noun

Example: His astonishment was clear when he saw the gift.

Category: Arts

Synonyms:

• surprise
• amazement

Antonyms:

• indifference
• apathy

Meaning: To shock or greatly surprise someone.

Part of speech: verb

Example: The news will astound everyone.

Category: Arts

Synonyms:

• amaze
• astonish

Antonyms:

• bore
• unimpress

Meaning: Extremely surprised or shocked.

Part of speech: adjective

Example: He was astounded by the performance.

Category: Arts

Synonyms:

• amazed
• astonished

Antonyms:

• unimpressed
• bored

Meaning: Very surprising or shocking.

Part of speech: adjective

Example: The results were astounding.

Category: Arts

Synonyms:

• amazing
• incredible

Antonyms:

• ordinary
• unremarkable

Meaning: A type of fur from young lambs.

Part of speech: noun

Example: The coat was made of astrakhan.

Category: Fashion

Synonyms:

• fur
• material

Meaning: Relating to the stars or celestial bodies.

Part of speech: adjective

Example: The astral plane is a concept in spirituality.

Category: Science › Astronomy

Synonyms:

• celestial
• stellar

Meaning: Away from the correct path or direction.

Part of speech: adverb

Example: He went astray in the dark.

Category: Navigation

Synonyms:

• off course
• lost

Antonyms:

• on track
• guided

Meaning: With a leg on each side.

Part of speech: adverb

Example: He sat astride the horse.

Category: Sports

Synonyms:

• straddling
• spreading

Meaning: The quality of being astringent.

Part of speech: noun

Example: The astringency of the fruit made it less appealing.

Category: Medicine › Health

Synonyms:

• tightness
• constriction

Meaning: Causing the contraction of body tissues.

Part of speech: adjective

Example: The astringent lotion helped with her skin.

Category: Medicine › Health

Synonyms:

• tightening
• constricting

Antonyms:

• relaxing
• loosing

Meaning: A prefix meaning 'star' or 'celestial'.

Part of speech: prefix

Example: The term 'astronomy' uses the prefix astro-.

Category: Science

Meaning: A brand of synthetic turf used for sports fields.

Part of speech: noun

Example: The football field was covered with Astro Turf.

Category: Sports

Synonyms: artificial turf

Meaning: An ancient instrument used to make astronomical measurements.

Part of speech: noun

Example: The astrolabe was used by sailors for navigation.

Category: Science › Astronomy

Synonyms:

• navigation tool
• measuring device

Meaning: A person who studies the movements of celestial bodies and their influence on human affairs.

Part of speech: noun

Example: The astrologer predicted the future based on the stars.

Category: Science › Astronomy

Synonyms:

• forecaster
• seer

Meaning: Relating to astrology.

Part of speech: adjective

Example: She read her astrological chart.

Category: Science › Astronomy

Synonyms:

• zodiacal
• horoscopic

Meaning: The study of the movements of celestial bodies and their influence on human affairs.

Part of speech: noun

Example: Many people believe in astrology.

Category: Science › Astronomy

Synonyms:

• horoscopy
• zodiac

Meaning: The branch of astronomy that deals with the measurement of the positions and movements of celestial bodies.

Part of speech: noun

Example: Astrometry is essential for understanding the universe.

Category: Science › Astronomy

Synonyms:

• celestial measurement
• astronomical measurement

Meaning: A person trained to travel in space.

Part of speech: noun

Example: The astronaut conducted experiments on the space station.

Category: Science › Astronomy

Synonyms:

• space traveler
• cosmonaut

Meaning: A scientist who studies celestial bodies and the universe.

Part of speech: noun

Example: The astronomer discovered a new planet.

Category: Science › Astronomy

Synonyms:

• scientist
• astrophysicist

Meaning: Extremely large or great.

Part of speech: adjective

Example: The costs of the project were astronomical.

Synonyms:

• enormous
• immense

Antonyms:

• tiny
• small

Meaning: A unit of measurement equal to the average distance from the Earth to the Sun, approximately 93 million miles or 150 million kilometers.

Part of speech: noun

Example: The distance to the nearest star is about four light years or 268,000 astronomical units.

Category: Science › Astronomy

Meaning: The scientific study of celestial bodies, space, and the universe as a whole.

Part of speech: noun

Example: Astronomy helps us learn about planets and stars.

Category: Science

Synonyms:

• stargazing
• cosmology