The difference between One and Unity
When used as nouns, one means the digit or figure 1, whereas unity means oneness.
One is also pronoun with the meaning: one thing (among a group of others).
One is also numeral with the meaning: the represented by the.
One is also verb with the meaning: to cause to become one.
One is also adjective with the meaning: of a period of time, being particular.
check bellow for the other definitions of One and Unity
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One as a pronoun (impersonal pronoun, indefinite):
One thing (among a group of others); one member of a group.
Examples:
"The big one looks good.  I want the green one.  nowrap A good driver is one who drives carefully."
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One as a pronoun (impersonal pronoun, sometimes with "the"):
The first mentioned of two things or people, as opposed to the other.
Examples:
"She offered him an apple and an orange; he took one and left the other."
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One as a pronoun (indefinite personal pronoun):
Any person (applying to people in general).
Examples:
"One’s guilt may trouble one, but it is best not to let oneself be troubled by things which cannot nowrap be changed.  nowrap One shouldn’t be too quick to judge."
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One as a pronoun (pronoun):
Any person, entity or thing.
Examples:
"driver", noun: one who drives."
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One as a noun:
The digit or figure 1.
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One as a noun (mathematics):
The neutral element with respect to multiplication in a ring.
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One as a noun (US):
A one-dollar bill.
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One as a noun (cricket):
One run scored by hitting the ball and running between the wickets; a single.
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One as a noun:
A joke or amusing anecdote.
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One as a noun (colloquial):
A particularly special or compatible person or thing.
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One as a noun (Internet slang, leet, sarcastic):
Used instead of ! to amplify an exclamation, parodying unskilled typists who forget to press the shift key while typing exclamation points, thus typing "1".
Examples:
"A: ''SUM1 Hl3p ME im alwyz L0ziN!!?!"
"B: ''y d0nt u just g0 away l0zer!!1!!one!!one!!eleven!!1!"
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One as an adjective:
Of a period of time, being particular.
Examples:
"'One day the prince set forth to kill the dragon that had brought terror to his father’s kingdom for centuries."
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One as an adjective:
Being a single, unspecified thing; a; any.
Examples:
"My aunt used to say, "One day is just like the other."
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One as an adjective:
Sole, only.
Examples:
"He is the one man who can help you."
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One as an adjective:
Whole, entire.
Examples:
"Body and soul are not separate; they are one."
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One as an adjective:
In agreement.
Examples:
"We are one on the importance of learning."
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One as an adjective:
The same.
Examples:
"The two types look very different, but are one species."
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One as an adjective:
Being a preeminent example.
Examples:
"He is one hell of a guy."
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One as an adjective:
Being an unknown person with the specified name; see also "a certain".
Examples:
"The town records from 1843 showed the overnight incarceration of one “A. Lincoln”."
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One as a verb (obsolete, transitive):
To cause to become one; to gather into a single whole; to unite.
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Unity as a noun (uncountable):
Oneness; the state or fact of being one undivided entity.
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Unity as a noun:
A single undivided thing, seen as complete in itself.
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Unity as a noun (drama):
Any of the three classical rules of drama: unity of action (nothing should be admitted not directly relevant to the development of the plot), unity of place (the scenes should be set in the same place), and unity of time (all the events should be such as might happen within a single day).
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Unity as a noun (mathematics):
The number 1 or any element of a set or field that behaves under a given operation as the number 1 behaves under multiplication.
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Unity as a noun (legal):
The peculiar characteristics of an estate held by several in joint tenancy.
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Unity as a noun (Quakerism):
The form of consensus in a Quaker meeting for business which signals that a decision has been reached. In order to achieve unity, everyone who does not agree with the decision must explicitly stand aside, possibly being recorded in the minutes as doing so.