Enact

enact stems from the Latin prefix en- meaning "to make; cause to be" plus the Latin root act- meaning "to do." Thus, enact means "to cause to be done" or, specifically, "to make into a law."
The Senate enacted a bill against air pollution.

A word based on enact is enactment, meaning "the passing of a law" or "a law that has been passed."
The Senate's enactment of the air pollution bill goes into effect today.

Actual

actual comes from the Latin word actus, "a doing", which is based on act- meaning "to do" and the Latin suffix -al which means "pertaining to; characterized by". Actual means "pertaining to something that is in action or in existence now"; thus, it means "existing; real"
What were his actual words?
Two words based on actual are actually, meaning "really" or "truly," and actuality, which means "reality; truth; fact."
What did he actually say?
Our dream of reaching the moon has become an actuality.

Actor

actor is formed from act- meaning "to do" and the Latin suffix -or meaning "a person who or a thing that perform an action." An actor is thus "a person who does something" or "a person who acts."
My son was an actor in the struggle, not an onlooker.
He was an actor in the play.
A word related to actor is its female form, actress.

Active

active comes from act- meaning "to do" plus the Latin suffix -ive which means "inclined to; tending to; having the character or quality of." Thus, active means "inclined to action; working; busy; lively."
She leads an active social life.
This is an active volcano.
One should have an active bank account.

Two words based on activee are activity and activate. Activity means "the state of being active; a particular action." Activate means "to make active or make capable of action."
There was little activity on the stock market today.
Can you activate this machine?

Agile

agile is made up of ag- meaning "to do" and the Latin suffix -ile which means "pertaining to; like; having the character or quality of." Thus, agile means "having the quality of doing or acting" or "able to do or move quickly and easily; nimble."
Peter is agile and athletic.
A word based on agile is agility, meaning "the ability to move quickly and easily."
The quarterback had remarkable agility.

Agent

agent comes from ag- meaning"to do" plus the Latin suffix -ent which means "a person who." Thus, agent means "a person who does something." This word is applied to someone who does a specific action or job, or who works for or represents an individual, company, or government bureau.

He is an FBI agent.
Does the actor have a press agent?
Does that company have a sales agent in our town?

A word based on agent is agency, meaning "a company, department or bureau that does a specific job or that represents other people or companies."

She works for an employment agency.

Agenda

agenda comes directly from a Latin word based on ag- meaning "to do" and means "a list of things to be done; a list of things to be discussed or decided upon."
There were three items on the agenda for the business meeting.

Root: Ag-, Act-

The Latin ag- or act- means "to do; drive". This root forms some of the most frequently used words in the English Language. You already know some common words based on it, such as act or action. Here are seven more core words based on the root ag- or act- that tou should know: agenda, agent, agile, active, actor, actual, enact.

Acute

acute stems from a Latin word meaning "to sharpen". Acute means "sharp" or "coming to a sharp point" and thus it has also come to mean "reaching a crisis; critical; keen; intense; violent". Note carefully these various meanings in the following sentences:
An acute angle is an angle of less than 90 degrees.
He is suffering from an acute appendicitis.
The food shortage in India is becoming acute.
The boy has a quick, acute mind.
His toothache was causing acute pain.
A word based on acute is acutely, meaning "intensely; extremely; keenly; highly".
He was acutely conscious of their disapproval.

Acumen

acumen comes directly from a Latin word meaning "sharpness of mind; intelligence".
Johny has shown great acumen in his schoolwork.

Acuity

acuity is made up of acu- meaning "sharp" and the Latin suffix -ity which means "the state, condition, or quality of being". Thus, acuity means "the state or condition of being sharp", but it is applied to sharpness or acuteness of the mind or senses.
The professor has great mental acuity.

Acrimony

acrimony comes from acr- meaning "sharp" and the Latin suffix -mony which means "quality of being". Specifically, acrimony means "sharpness of speech or temper".
Our quarrel was full of acrimony.
A word based on acrimony is acrimonious, meaning "full of bitterness; sharp; sarcastic".
Their discussion turned into an acrimonious debate.

Acrid

acrid comes from acr- meaning "sharp" and the Latin suffix -id meaning "having a particular quality". Thus, acrid means "having a sharp quality in taste or smell; bitter or burning to the senses".
The acrid smoke hurt our eyes.
A word based on acrid is acridity, meaning "the state or quality of being acrid; acridness".
The acridity of the smoke made our eyes water.

Root: Acu-, Acr-

The Latin root acu- or acr- means "sharp". You should sharpen your vocabulary with the five core words in which the root acu- or acr- appear: acrid, acrimony, acuity, acumen, acute.

Vivid

Vivid stems from the Latin root viv- meaning "to live" and the suffix -id meaning "having a certain quality" . Thus, vivid means “having the quality of life; lifelike; lively; not dull”.
The boy had a vivid imagination.
She loved to wear vivid colors.
Andrews' novels are full of vivid characterizations.

Vivacious

Vivacious is formed from the the Latin root viv- meaning "to live" and the suffix -acious meaning "abounding in; given to" . Thus, vivacious means “full of life; lively; active”.
The young actress was charming and vivacious.

Vitamin

Vitamin is formed from the the Latin root vit- meaning "life" and the suffix -amin meaning "amine" (an organic chemical compound). Thus, vitamin means “an organic substance found in most foodstuff that is necessary for normal life functions in man and animals”.
Vitamin C, found in oranges and apples, prevent scurvy.

Vital

Vital is formed from the the Latin root vit- meaning "life" and the suffix -al meaning "pertaining to" or “full of”. Thus, vital means (1)pertaining to (0r necessary for) life; (2) full of life.
Oxygen is vital for all animals.
He is a happy, vital person.
Vital statistics relates to births, deaths, marriages, etc.

Revive

Revive comes prom the prefix re- meaning "again" and the Latin root viv-meaning "to live". Thus, revive means "to live again; to bring back to life, strength, health or consciousness".
The lifeguard revived the boy by artificial respiration.
After a hard day’s work, a delicious meal revived him.

Root: vit-, viv-

The root vit- comes from a Latin noun meaning "life", and its variant spelling viv- comes from a Latin verb meaning "to live"