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on tiptoe	standing or walking on the toes, especially to proceed quietly or cautiously. [2 definitions]
onto	to a position on or on top of. [2 definitions]
on top of	in total control of. [3 definitions]
onward	toward a point or position ahead in space or time. [2 definitions]
ooze¹	to leak out slowly. Liquids, gases, and sounds may ooze.
opal	a mineral that is white, black, blue, or yellow. Opals are used as gems.
opaque	not letting light pass through. [2 definitions]
OPEC	an association made up of several Arab nations that sell the oil they produce to other countries. "OPEC" is an abbreviation of "Organization of Petroleum Exporting Countries."
open	allowing something or someone to pass through or to get to the inside; not shut or closed. [16 definitions]
opener	someone or something that opens. [3 definitions]
opening	the act, process, or result of making open or causing to become open. [5 definitions]
openly	in a way that involves no hiding or lying.
open-minded	not having made opinions or decisions ahead of time; willing to consider new ideas.
opera¹	a play in which all or most of the words are sung and the music is played by an orchestra.
operate	to work or run. [3 definitions]
operation	the act or process of working or running. [4 definitions]
operator	someone who controls the working of a machine or the activities of a business. [2 definitions]
operetta	a short, funny opera, with words that are spoken as well as sung.
ophthalmologist	a doctor who works in the branch of medicine that studies and treats diseases of the eye.
ophthalmology	the branch of medicine that studies and treats diseases of the eye.
opinion	what one thinks about something or somebody; viewpoint. An opinion is not necessarily based on facts. Feelings and experiences usually help a person form an opinion. [3 definitions]

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