Discover a variety of words starting with the prefix “on” and learn how each one can enhance your vocabulary.
- On- Used to indicate position, usually indicating that something is on top of something else.
- Once- At one time in the past; formerly.
- Only- No one or nothing more besides; solely or exclusively.
- Onto- To a position on the surface of something.
- Onus- Used to refer to something that is one’s duty or responsibility.
- Onyx- A semiprecious stone with bands of color, often used in jewelry or ornamentation.
- Onion- A bulbous plant with a strong taste and smell, used in cooking.
- Ongoing- Continuing; still in progress.
- Onset- The beginning or start, especially of something unwelcome.
- Onward- Moving forward or continuing.
- One- Referring to a single person or thing.
- Onlooker- A non-participating observer; spectator.
- Oneiric- Pertaining to dreams.
- Onboard- Being on or within a vehicle or vessel.
- Online- Controlled by or connected to a computer.
- Only- begotten** – Unique, often used in a religious context to indicate a divine relationship.
- Onomatopoeia- The formation of a word from a sound associated with what is named.
- Oneself- A reflexive form of the pronoun ‘one.’
- Onetime- Former, previous.
- Onrush- A sudden rapid movement forward.
- Onscreen- Appearing on a screen, especially in a cinema or television.
- Onsite- Located at the site.
- Onstage- Positioned on the stage, usually during a performance.
- Onshore- Landward; towards or onto the shore.
- Onslaught- A fierce or destructive attack.
- Ontology- A branch of metaphysics dealing with the nature of being.
- Onward- Directed or moving forward.
- Ontogeny- The development of an individual organism or anatomical or behavioral feature from the earliest stage to maturity.
- Ontologist- A person who studies or discusses the nature of being, existence, or reality.
- Onus- A burden, obligation, or difficult responsibility.
- Oncology- The study and treatment of tumors and cancer.
- Onlookers- People who watch something (often an event) but do not participate.
- Oncoming- Approaching, coming nearer.
- Onetime- Done or happening in the past, but not now.
- Oneness- The quality or state of being unified or whole.
- One- up** – To get an advantage over someone.
- On- file** – Recorded or stored in a file.
- One- off** – Done, made, or happening only once.
- On- dit** – A piece of gossip; a rumor.
- Onager- A wild ass of Asia.
- Onerous- Involving great effort and difficulty.
- On- lap** – Positioned on the lap.
- One- sided** – Favoring one side unduly; biased.
- Oncologic- Pertaining to the study of tumors and their treatment.
- Onnagata- A male performer in traditional Japanese Kabuki theater who specializes in playing female roles.
- Oneirism- A mental state involving a dream-like experience while awake.
- Onchocerciasis- A disease caused by a parasitic worm, also known as river blindness.
- On- core** – Central or core-related.
- Oneirist- A person who studies or interprets dreams.
- Oneiromancy- Divination through dreams.
- Oncogenic- Causing the development of a tumor or tumors.
- On- field** – Taking place on the field of play in sports.
- Onflow- Flow onward or forward.
- On- glaze** – A method of decorating ceramics with enamel applied after the initial firing.
- One- upmanship** – The technique or practice of gaining a feeling of superiority over another person.
- Oncogene- A gene that in certain circumstances can transform a cell into a tumor cell.
- Oncosphere- The larval form of certain parasites.
- Oneiricist- A specialist in the interpretation of dreams.
- Oncologist- A doctor who specializes in treating cancer.
- Onboarded- Enrolled or integrated into an organization.
This list includes diverse words starting with “on,” covering various forms of language including nouns, adjectives, and forms of medical and technical terminology.