Antonym: beneath, off. Similar words: in, of, oh, ok, one, or, own, son. Meaning: [ɑ /ɒn ,ən] 
adj. 1. in operation or operational 2. (of events) planned or scheduled. adv. 1. with a forward motion 2. indicates continuity or persistence or concentration 3. in a state required for something to function or be effective.
adj. 1. in operation or operational 2. (of events) planned or scheduled. adv. 1. with a forward motion 2. indicates continuity or persistence or concentration 3. in a state required for something to function or be effective. 
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181. Don't park your car on a busy thoroughfare.
182. The government has declared war on illiteracy.
183. Which side are you on in this question?
184. There is a small evergreen shrub on the hillside.
185. The train pulled in exactly on time.
186. He has a mother completely dependent on him.
187. Teachers have expressed concern about the emphasis on testing.
188. He refused the request on moral grounds.
189. Norway's economy is heavily dependent on natural resources.
190. Music will be played on a phonograph.
191. The council discussed the proposed law on taxes.
192. This medicine acts on the heart.
193. She has all the gen on cheap flights.
194. When the storm rose on the river,[www.Sentencedict.com] they had to bale out to reach the shore safely.
195. It was considered a sin to work or play on the Sabbath.
196. It was the first show to use the F-word and show nudity on stage.
197. You spend a disproportionate amount of your time on sport.
198. One can eat only 1500 calories a day on this diet.
199. The prospect of change of this kind has an unsettling effect on any organisation.
200. I babysit for Jane on Tuesday evenings while she goes to her yoga class.
201. The pipeline was constructed to transport oil across Alaska to ports on the coast.
202. The child couldn't keep his balance on his new bicycle.
203. She was determined to avenge herself on the man who had betrayed her.
204. We found an old sheep skeleton up on the cliffs.
205. The court acquitted Campbell on the grounds of temporary insanity.
206. His views on knowledge economy have been accepted with unamity.
207. We hope we can count on your continued cooperation and support.
208. She's due to arrive on Thursday. Meanwhile, what do we do?
209. No other organisation was able or willing to take on the job.
210. The rebels are poised for a new assault on the government garrisons.