13-Letter Words Starting With O

Here's the list of all the 475 13-Letter Words Starting With O in the English Language.

The list is arranged by the word lengths. Click on the length below to jump to the relevant section of the page.

Common Words (with Definitions and Examples)
objectionable
1. causing disapproval or protest
2. liable to objection or debate; used of something one might take exception to
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ophthalmology
1. the branch of medicine concerned with the eye and its diseases
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observational
1. relying on observation or experiment
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opportunistic
1. taking immediate advantage, often unethically, of any circumstance of possible benefit
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orchestration
1. an arrangement of a piece of music for performance by an orchestra or band
2. the act of arranging a piece of music for an orchestra and assigning parts to the different musical instruments
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13-Letter Words Starting With O