Meaning: A large excavation in the ground for mining or other purposes.

Part of speech: noun

Example: The open pit mine was visible from miles away.

Category: Geology

Synonyms:

• quarry
• excavation

Meaning: A type of prison with fewer restrictions on inmates.

Part of speech: noun

Example: He was transferred to an open prison for good behavior.

Category: Law › Criminal Law

Synonyms: minimum-security prison

Meaning: A period during which hunting is allowed.

Part of speech: noun

Example: It's open season for deer hunting this month.

Category: Nature › Wildlife

Synonyms: hunting season

Meaning: Clear and straightforward; easy to understand.

Part of speech: adjective

Example: It was an open-and-shut case.

Category: Law

Synonyms:

• clear-cut
• obvious

Antonyms:

• ambiguous
• complicated

Meaning: Having the mouth open, often in surprise.

Part of speech: adjective

Example: He stood there, open-mouthed at the amazing view.

Category: Emotion

Synonyms:

• astonished
• amazed

Antonyms:

• unimpressed
• indifferent

Meaning: Relating to opera or its style.

Part of speech: adjective

Example: The singer had an operatic voice.

Category: Arts › Music

Synonyms:

• dramatic
• theatrical

Meaning: A person who works in a specific job or role.

Part of speech: noun

Example: He is an operative in the intelligence agency.

Category: Business

Synonyms:

• agent
• worker

Meaning: A short opera, often with spoken dialogue.

Part of speech: noun

Example: The operetta was charming and entertaining.

Category: Arts › Music

Synonyms:

• musical
• light opera

Meaning: Relating to the eye or vision.

Part of speech: adjective

Example: The ophthalmic examination was thorough.

Category: Medicine › Ophthalmology

Synonyms: ocular

Meaning: A drug derived from opium, used for pain relief.

Part of speech: noun

Example: The doctor prescribed an opiate for the patient's pain.

Category: Medicine

Synonyms:

• painkiller
• narcotic

Meaning: To express an opinion.

Part of speech: verb

Example: He likes to opine on various topics.

Category: Communication

Synonyms:

• express
• state

Meaning: A narcotic drug obtained from the opium poppy.

Part of speech: noun

Example: Opium has a long history of use in medicine.

Category: Medicine

Synonyms:

• narcotic
• drug

Meaning: Occurring at a favorable or advantageous time.

Part of speech: adjective

Example: The rain came at an opportune moment for the farmers.

Category: Time

Synonyms:

• timely
• convenient

Antonyms:

• inopportune
• untimely

Meaning: A person with a similar position in a different organization.

Part of speech: noun

Example: She met her opposite number from the rival company.

Category: Business

Synonyms: counterpart

Meaning: Relating to vision or the eye.

Part of speech: noun

Example: The optic nerve transmits visual information to the brain.

Category: Science › Ophthalmology

Synonyms:

• visual
• ocular

Meaning: A visual phenomenon that tricks the eye.

Part of speech: noun

Example: The painting created an optical illusion.

Category: Science › Ophthalmology

Synonyms: visual trick

Meaning: Most favorable or best.

Part of speech: adjective

Example: This is the optimal solution to the problem.

Category: Decision Making

Synonyms:

• best
• ideal

Antonyms:

• suboptimal
• poor

Meaning: The most favorable condition or level.

Part of speech: noun

Example: The optimum for growth is a warm climate.

Category: Science

Synonyms:

• best condition
• ideal level

Meaning: Rich and luxurious.

Part of speech: adjective

Example: The hotel was decorated in an opulent style.

Category: Arts › Design

Synonyms:

• lavish
• sumptuous

Antonyms:

• poor
• simple

Meaning: A suffix used to form nouns indicating a person who performs a specific action.

Part of speech: suffix

Example: The term 'actor' uses the suffix '-or'.

Category: Language › Grammar

Meaning: A method of gathering and preserving historical information through recorded interviews.

Part of speech: noun

Example: The project focused on collecting oral histories from veterans.

Category: History › Research

Synonyms:

• testimony
• narrative

Meaning: The flower of the orange tree, often used in perfumes.

Part of speech: noun

Example: The orange blossom has a sweet fragrance.

Category: Nature › Flowers

Synonyms: citrus flower

Meaning: A formal speech, especially one given on a ceremonial occasion.

Part of speech: noun

Example: The president delivered an oration at the memorial service.

Category: Arts › Public Speaking

Synonyms:

• speech
• address

Meaning: The art of public speaking.

Part of speech: noun

Example: He was praised for his oratory skills.

Category: Arts › Public Speaking

Synonyms: rhetoric

Meaning: Relating to an orbit.

Part of speech: adjective

Example: The satellite is in an orbital path around the Earth.

Category: Science › Astronomy

Synonyms: circular

Meaning: Relating to an orchestra.

Part of speech: adjective

Example: The orchestral arrangement was stunning.

Category: Arts › Music

Synonyms: symphonic

Meaning: A record of orders received by a business.

Part of speech: noun

Example: The order book showed a significant increase in sales.

Category: Business › Finance

Synonyms: sales record

Meaning: A law or regulation made by a city or town government.

Part of speech: noun

Example: The city passed an ordinance to regulate noise levels.

Category: Law › Local Law

Synonyms:

• law
• regulation

Meaning: Military weapons and ammunition.

Part of speech: noun

Example: The army received new ordnance for training.

Category: Military › Weapons

Synonyms:

• arms
• munitions

Meaning: A thin, crisp fabric often used for dresses and curtains.

Part of speech: noun

Example: She chose organdie for her summer dress.

Category: Fashion › Materials

Synonyms: fabric

Meaning: Relating to the structure or arrangement of an organization.

Part of speech: adjective

Example: They implemented new organisational strategies.

Category: Business › Management

Synonyms: structural

Meaning: Relating to the structure or arrangement of an organization.

Part of speech: adjective

Example: They are reviewing their organizational policies.

Category: Business › Management

Synonyms: structural

Meaning: A suffix used to indicate a systematic arrangement.

Part of speech: suffix

Example: The term 'disorganized' uses the suffix '-organized'.

Category: Language › Grammar

Meaning: A thin, transparent fabric often used in formal wear.

Part of speech: noun

Example: She wore a dress made of organza to the gala.

Category: Fashion › Materials

Synonyms: fabric

Meaning: Relating to the East, especially East Asia.

Part of speech: adjective

Example: She loves oriental art and culture.

Category: Culture › Geography

Synonyms: Eastern

Meaning: A suffix used to indicate a focus or direction.

Part of speech: suffix

Example: The term 'goal-orientated' uses the suffix '-orientated'.

Category: Language › Grammar

Meaning: Familiar with or focused on a particular situation or environment.

Part of speech: adjective

Example: He is very results-orientated in his work.

Category: Business › Management

Synonyms:

• focused
• directed

Meaning: A suffix used to indicate a focus or direction.

Part of speech: suffix

Example: The term 'service-oriented' uses the suffix '-oriented'.

Category: Language › Grammar

Meaning: Aligned or focused on a particular direction or goal.

Part of speech: adjective

Example: The company is customer-oriented.

Category: Business › Management

Synonyms:

• focused
• directed

Meaning: The Christian doctrine of humanity's state of sin inherited from Adam and Eve.

Part of speech: noun

Example: The concept of original sin is fundamental in Christian theology.

Category: Religion › Christianity