obliteration
The total destruction of something.
The concealing or covering of something.
The cancellation, erasure or deletion of something.
The cancellation of the function, structure, or both of a vessel or organ; for example, the occlusion of the lumen of a duct, blood vessel, or lymphatic vessel, be it solely functional (as when squeezed by nearby mass effect or inflammation) or both structural and functional (as when clogged with thrombus, embolus, or fibrosis).

obliterationism
A policy of obliteration.

obliterations
plural of obliteration

obliviality
Liability to be forgotten.

obliviation
Total removal or erasure.

obliviousness
The characteristic of being oblivious.

obliviousnesses
plural of obliviousness

obliviscence
Forgetfulness.

oblongata
Clipping of medulla oblongata.

oblongatas
plural of oblongata.

oblongitude
The property of being oblong in shape.

oblongness
The quality of being oblong in shape.

obluctation
opposition; resistance

obluctations
plural of obluctation

obmurmuration
The action or an instance of complaining or criticizing.

obmurmurations
plural of obmurmuration

obmutescence
Silence; inability or refusal to speak.

obnoxieties
plural of obnoxiety

obnoxiety
obnoxiousness

obnoxiosity
The quality of being obnoxious.

obnoxiousness
The characteristic of being obnoxious.

obnoxiousnesses
plural of obnoxiousness

obnoxities
plural of obnoxity.

obnoxity
The quality of being obnoxious.
Something obnoxious.

obnubilation
The action of darkening or fact of being darkened, as with a cloud; obscuration.
Obscuration or clouding of the mind or faculties.
A veiling with or concealment in clouds.
Something that obscures or causes confoundment; an obfuscation.

obnubilations
plural of obnubilation

obook
An online book

obooks
plural of obook

obrazovanshchina
a class of people with superficial education but without the higher ethics of an educated person

obreption
The act of creeping upon with secrecy or by surprise.
Act of obtaining gifts of escheat by fraud or surprise.
The inclusion of false statements in a petition for a rescript.

obreptions
plural of obreption

obrogation
The act of obrogating.

obround
A plane shape consisting of two semicircles connected by parallel lines tangent to their endpoints.
A feature or component with an obround shape.

obrounds
plural of obround

obruption
Quick burial.

obrution
A rapid burial or smothering event.

obrutions
plural of obrution

obsceneness
Quality of being obscene.

obsceneries
plural of obscenery

obscenery
Synonym of obscenity.

obscenities
plural of obscenity

obscenity
Something that is obscene.
An act of obscene behaviour.
Specifically, an offensive word; a profanity; a dirty word.
Lewdness, indecency, or offensive behaviour or material.
The fact of being obscene.

obscurancy
Synonym of obscurity.

obscurantism
A state of opposition to human progress or enlightenment.
Deliberate obscurity or vagueness.

obscurantisms
plural of obscurantism

obscuration
The state of being obscured.
A unit of measurement used in particular for smoke detectors which respond to absorption of light by smoke, in percent absorption per unit length, e.g. % obs/ft, % obs/m.

obscurationism
The policy of obscuration.

obscurations
plural of obscuration

obscurement
The act of obscuring, or the state of being obscured.

obscurements
plural of obscurement

obscureness
The state or quality of being obscure.

obscurenesses
plural of obscureness

obscurification
The act of making something obscure, or (in computing) obfuscating source code etc.

obscurifications
plural of obscurification

obscurism
The practice of being obscure.

obscurities
plural of obscurity

obscurity
Darkness; the absence of light.
The state of being unknown; a thing that is unknown.
The quality of being difficult to understand; a thing that is difficult to understand.

obsecration
An earnest supplication made in the name of God

obsecrations
plural of obsecration

obsequence
Compliance, obsequiousness, deference, willingness to serve.

obsequences
plural of obsequence

obsequency
obsequiousness

obsequie
Obsolete form of obsequy.

obsequience
obsequiousness

obsequiences
plural of obsequience

obsequies
Funeral rites.

obsequiosity
Obsequiousness.

obsequiousness
The quality of being obsequious; servile compliance.

obsequiousnesses
plural of obsequiousness

obsequities
plural of obsequity

obsequity
The state of being obsequious; unctuousness

obsequy
The last office for the dead.
A funeral rite or service.

observabilities
plural of observability

observability
The state of being observable.
A measure of the extent to which something is observable.
The ability to collect data about the execution of distributed programs, especially the interaction among its components.

observableness
observability

observance
The practice of complying with a law, custom, command or rule.
The custom of celebrating a holiday or similar occasion.
Observation or the act of watching.
A rule governing a religious order, especially in the Roman Catholic church.
That which is to be observed.
Reverence; homage.

observances
plural of observance

observancies
plural of observancy

observancy
Obsolete form of observance.

observandum
A thing to be observed.

observantness
Quality of being observant.

observation
The act of observing, and the fact of being observed (see observance)
The act of noting and recording some event; or the record of such noting.
A remark or comment.
A judgement based on observing.
Performance of what is prescribed; adherence in practice; observance.
A regime under which a subject is routinely observed.
A realization of a random variable.

observationalism
The philosophical approach that derives knowledge from observations.

observationality
The property of being observational.

observations
plural of observation

observaunce
Obsolete form of observance.

observaunces
plural of observaunce

observership
The office or work of an observer.
observance

obsesh
Obsession.

obseshes
plural of obsesh

obsessedness
The quality of being obsessed; obsession.

obsession
The quality of being obsessed.
An idea that engenders a compulsive or irrational preoccupation, or the preoccupation thereby engendered.
An activity or entity that inspires a compulsive and potentially unhealthy fixation, or the fixation thereby inspired.
Influence or control by evil spirits without possession.

obsessionalism
obsessive behaviour

obsessionality
The quality of being obsessional.

obsessionism
Obsessiveness.

obsessions
plural of obsession

obsessiveness
The characteristic of being obsessive.

obsignation
The act of sealing or ratifying.
Confirmation, as by the Holy Spirit.

obsignations
plural of obsignation

obsolescence
The state of being obsolete—no longer in use; gone into disuse; disused or neglected.
The process of becoming obsolete, outmoded or out of date.

obsolescences
plural of obsolescence

obsoleteness
The quality or state of being obsolete or no longer in use.
The quality of being imperfectly or indistinctly developed.

obsoletenesses
plural of obsoleteness

obsoletion
Obsolescence.

obsoletions
plural of obsoletion

obsoletism
A disused word or phrase; an archaism.

obsoletisms
plural of obsoletism

obsoletor
Something which obsoletes something else.

obsoletors
plural of obsoletor

obstacle
Something that impedes, stands in the way of, or holds up progress, either physically or figuratively

obstacles
plural of obstacle

obstancies
plural of obstancy

obstancy
Opposition, impediment, or obstruction.

obstetrication
obstetrics or midwifery

obstinacies
plural of obstinacy

obstinacy
The state, or an act, of stubbornness or doggedness.
A group of bison; the collective noun for bison.

obstinance
The characteristic of being obstinate.

obstinances
plural of obstinance

obstinateness
The characteristic of being obstinate.

obstinatenesses
plural of obstinateness

obstination
stubbornness