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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121. She struck him on the nose.
122. Does life exist on other planets?
123. The teacher will test us on our French.
124. He looked longingly at the food on the table.
125. I just want to crash out on the sofa.
126. We gorged ourselves on ripe plums.
127. Her sunglasses were perched on her head.
128. I clapped Mark on the shoulder.
129. We have two politicians on tonight's panel.
130. Memory will fade[sentence dictionary], but my heart will go on.
131. Use a soap that is mild on the skin.
132. The region's hard-pressed consumers are spending less on luxuries.
133. The mistletoe plant is a parasite on trees.
134. Come on in - you're drenched!
135. As babies, we rely entirely on others for food.
136. The wave heaved the boat on land.
137. A special subcommittee adjudicates on planning applications.
138. She was awake during the operation on her leg.
139. After lunch he reposed on the couch.
140. They charged the accident on him.
141. I didn't see you in church on Sunday.
142. He has gone on a walking tour.
143. The earth revolves on its axis.
144. Familiar scenes were imaged on the screen.
145. Unaccompanied children are not allowed on the premises.
146. The wound on my arm has healed.
147. I think he has a crush on u.
148. Each paragraph begins on a new line.
149. Huge sums of money are spent on national defence.
150. We spent every possible moment on the beach.