o

O, o

O o

Definitions of o word

noun plural o the fifteenth letter of the English alphabet, a vowel. 1
noun plural o any spoken sound represented by the letter O or o, as in box, note, short, or love . 1
noun plural o something having the shape of an O . 1
noun plural o a written or printed representation of the letter O or o. 1
noun plural o a device, as a printer's type, for reproducing the letter O or o. 1
noun plural o the exclamation “O.”. 1

before 1125

One of the 6% oldest English words

1125-75; Middle English < Old French < Latin ō

noun

adjective

verb

adverb

pronoun

preposition

conjunction

determiner

exclamation

A common word. It’s meaning is known to most children of preschool age. About 100% of English native speakers know the meaning and use the word.

Most Europeans know this English word. The frequency of it’s usage is somewhere between "mom" and "screwdriver".

This diagram is provided by Google Ngram Viewer

energy — The strength and vitality required for sustained physical or mental activity.
activity — Activity is a situation in which a lot of things are happening or being done.
animation — Animation is the process of making films in which drawings or puppets appear to move.
application — An application for something such as a job or membership of an organization is a formal written request for it.
ardour — Ardour is a strong, intense feeling of love or enthusiasm for someone or something.

secretly — done, made, or conducted without the knowledge of others: secret negotiations.
behind closed doors — If people have talks and discussions behind closed doors, they have them in private because they want them to be kept secret.
behind someone's back — without someone's knowledge or consent
clandestinely — characterized by, done in, or executed with secrecy or concealment, especially for purposes of subversion or deception; private or surreptitious: Their clandestine meetings went undiscovered for two years.
confidentially — Confidentially is used to say that what you are telling someone is a secret and should not be discussed with anyone else.

apathy — You can use apathy to talk about someone's state of mind if you are criticizing them because they do not seem to be interested in or enthusiastic about anything.
dullness — not sharp; blunt: a dull knife.
helplessness — unable to help oneself; weak or dependent: a helpless invalid.
idleness — the quality, state, or condition of being lazy, inactive, or idle: His lack of interest in the larger world and his consummate idleness were the causes of their dreadful divorce.
impotence — the condition or quality of being impotent; weakness.