Initial O
- oak: any tree or shrub of the genus Quercus; durable wood of any of these trees or shrubs
- oar: long, thin, usually wooden pole with a blade at one end, used to row or steer a boat
- oath: solemn promise; commitment to tell the truth
- obedient: subject in will or act to authority; willing to obey; submissive to restraint, control, or command
- object: be averse to or express disapproval of
- objection: act of expressing earnest opposition or protest
- objective: not influenced by emotions; having actual existence or reality
- obligation: act of binding oneself by a social, legal, or moral tie; written promise to repay a debt
- oblige: force; bind by an obligation; cause to be indebted; do a service or favor for
- obliterate: destroy completely; do away with completely so as to leave no trace
- oblong: having greater length than breadth, especially when rectangular
- obscure: darken; make dim or indistinct; conceal in obscurity
- observance: act or practice of observing or noticing with attention; an act, ceremony, or rite, as of worship or respect
- observe: be on the watch respecting; pay attention to; notice with care; see; perceive
- obstacle: one that opposes, stands in the way of, or holds up progress
- obstinate: stubbornly adhering to an attitude or opinion; hard to control or treat
- obstruction: act of obstructing; any structure that makes progress difficult
- obtain: get hold of; gain possession of; acquire, in any way
- obtainable: available; capable of being obtained
- obvious: exposed; easily discovered; plain
- occasion: significant event that occurs at a critical time; opportunity to do something; event or happening
- occasional: random; occurring from time to time; infrequent
- occasionally: now and then; from time to time; infrequently; irregularly
- occupation: act of occupying or taking possession; control of a country by military forces of a foreign power
- occupy: inhabit; live in a certain place; be present in; be inside of
- occur: take place; be found to exist ; come to one’s mind
- occurrence: an event that happens
- odd: not easily explained; beyond from the usual or expected; not divisible by two
- odour: any smell, whether fragrant or offensive; scent; perfume
- offence: act of causing anger, resentment, displeasure, or affront; violation or infraction of moral or social code
- offend: strike against; attack; assail; make angry; affront
- offensive: causing anger, displeasure, resentment, or affront
- offer: act of presenting; something, such as a suggestion, proposal, bid, or recommendation
- offset: counterbalance, counteract, or compensate for; balance
- offspring: descendant
- omen: any indication or action regarded as a foreshowing; phenomenon supposed to portend good or evil
- ominous: threatening; foreshadowing evil or tragic developments
- omission: act of omitting; neglect or failure to do something required by propriety or duty
- omit: leave undone or leave out ; bypass; neglect; fail to include or mention
- onset: beginning or early stages; offensive against enemy
- opaque: impenetrable by light; not transparent; not reflecting light; having no luster
- opera: a drama set to music and consists of singing
- operative: having power of acting; exerting force, physical or moral; active in the production of effects
- opinion: notion or conviction founded on probable evidence; belief stronger than impression; favorable estimation
- opponent: contestant; someone who offers opposition ; adverse; hostile; opposing
- opportune: timely; just in time; suited or right for a particular purpose
- opportunity: favorable or advantageous circumstance; chance for progress or advancement
- oppose: place in front of, or over against; set opposite; exhibit; confront; resist; withstand
- opposite: two words that express opposing concepts; contrariwise; directly facing each other opposition: condition of being in conflict; act of opposing something
- optical: of or relating to or involving light or optics
- optimal: most advantageous; optimum; ideal
- optimism: tendency to expect the best possible outcome; belief that the universe is improving and good will win over evil
- optimistic: hopeful; positive; expecting the best in all possible ways
- optimum: most favorable or advantageous
- option: act of choosing; power or freedom to choose
- optional: not obligatory; left to choice; not compulsory or automatic
- oral: spoken; unwritten; relating to the mouth
- orbit: path; circle; move in an orbit; encircle
- orchard: garden; area of land devoted to the cultivation of fruit or nut trees
- orchestra: band
- orderly: conformed to order; in order; regular; well-regulated
- ore: mineral that contains metal that is valuable enough to be mined
- organ: natural part or structure in animal or plant, capable of performing some special action
- organic: simple and healthful and close to nature
- organism: living being; system considered analogous in structure or function to a living body
- orient: focus toward; determine position with reference to another point; locate to face the east
- oriental: of or relating to the countries of the orient or their peoples or cultures; eastern
- orientation: act of finding oneself position; position or alignment relative to points of directions; course introducing new situation
- origin: the first existence or beginning of anything; birth; fountain
- original: not second hand; not copied or translated from something else
- originality: novelty; creativity; capacity to act or think independently
- originate: initiate; invent; bring into being; create
- ornament: decoration; something used to beautify
- ornamental: decorative; any plant grown for its beauty or ornamental value
- ounce: unit of weight equal to one sixteenth of a pound
- outbreak: beginning; eruption; explosion
- outcome: result; end or consequence; result of a random trial
- outdoors: out of house; out of doors
- outermost: far most; utmost; outmost; most distant from the center or inside
- outlandish: unconventional; strikingly unfamiliar; located far from civilized areas
- outlaw: person excluded from the benefit of the law, or deprived of its protection; fugitive from the law; habitual criminal
- outlet: an opening that permits escape or release; activity that releases creative energy or emotion
- outline: line that appears to bound an object
- outlook: prospect; view; belief about the future ; act of looking out
- output: act or process of producing; production; amount produced during a certain time
- outrage: act of extreme violence or viciousness; offense
- outrageous: of the nature of an outrage; exceeding the limits of right, reason
- outright: altogether; entirely; without reservation or exception
- outset: beginning; start; origin; time at which something is supposed to begin
- outstanding: distinguished from others in excellence
- oval: elliptic; rounded like an egg
- overall: general; comprehensive; from one end to the other; including everything
- overcast: covered or obscured, as with clouds or mist; gloomy; melancholy
- overcharge: overprice; a price that is too high
- overcome: defeat another in competition or conflict; conquer; prevail over
- overestimate: make too high an estimate of
- overflow: flow over; cover with, or as with, water or other fluid; spread over; flow over the brim of
- overhear: hear more of anything than was intended to be heard; hear again
- overlap: representation of common ground between two things; extend over and cover a part of
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- overlapping: covering with a design in which one element covers a part of another
- overload: place too much a load on
- overlook: ignore; disregard; fail to notice ; watch over
- overseas: beyond or across the sea; abroad
- oversight: unintentional omission or mistake; watchful care or management; supervision
- overtake: come up with in a course, pursuit, progress, or motion; catch up with; come upon from behind; capture; overcome
- overthrow: throw over; overturn; upset; turn upside down; cause to fall or to fail
- overtime: beyond the regular time
- overwhelm: defeat; cover completely or make imperceptible; overcome by superior force ; charge someone with too many tasks
- overwhelming: overpowering in effect or strength; very great or intense; extreme
- owe: be in debt; be obliged to pay or repay
- owl: any species of raptorial birds of the family Strigidae
- own: belonging to oneself or itself; not foreign; domestic
- ownership: having and controlling property
- oxide: binary compound of oxygen with an atom or radical, or a compound which is regarded as binary
- oxygen: a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas
- oyster: marine mollusks having a rough irregular shell
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