Terminology

Not doing or eating something.  During the Season of Lent it is recognized as refraining from eating meat on Ash Wednesday, the the Fridays of Lent, including Good Friday. This applies to people of good health who are age fourteen and older. Abstinence is a part of the practice of fasting.

The beginning and the basis of the whole Christian life. Baptism serves as the gateway to life in the Spirit and provides access to the other sacraments. [1]

Within the group of seven sacraments, Baptism is the first of the seven sacraments. Without baptism there is no access to the other sacraments the for it is said to open up for us the other sacraments. Baptism is the first and chief sacrament of forgiveness of sins.[2] Baptism unites us with Christ, who died for our sins and rose for our justification. The rite of Baptism consists in immersing the candidate in water, or pouring water on the head, while pronouncing the invocation of the Most Holy Trinity: the Father, the Son, and the Holy Spirit [3].

See Also : RCIA Lesson on Baptism

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1.) CCC1213

2.) Acts 2:37-39 -   37   Now when they heard this, they were cut to the heart, and they asked Peter and the other apostles, “What are we to do, my brothers?”
38  Peter [said] to them, “Repent and be baptized,* every one of you, in the name of Jesus Christ for the forgiveness of your sins; and you will receive the gift of the holy Spirit.   39  For the promise is made to you and to your children and to all those far off, whomever the Lord our God will call.”

3.) CCC 977, 1213

Also referred to as Sacred Scripture. The Bible is a collection of books which contain the truth of God's Revelation. These books were composed by human authors who were inspired by the Holy Spirit. The Bible has two groups of books. Old Testament which contains forty-six books. And the New Testament which contains twenty seven books.

See Old Testament; New Testament
See also: About the Bible; Canon of the Bible

This term as used in the OCIA/RCIA process has it's emphasis changed and its use as well during the process.
Whereas initially all persons in the Pre-Catechumenate can be called a "Candidate"(see in the OCIA/RCIA rite book #38).

However, after the Rite of Acceptance, those who are unbaptized are now referred to as "Catechumens and those who have received only the Sacrament of Baptism or a valid baptism prior to entering the OCIA/RCIA, are still referred to as candidates. The term candidates applies as follows:

1. A participant in the period pre-catechumenate period (OCIA/RCIA #38).

2. A person who was baptized as a Catholic but has not received any or little catechetical formation. And have not received the sacraments of confirmation and Eucharist (OCIA/RCIA #400-410). 

3. A person who has a valid baptism in another Christian faith, has not received a suitable catechesis.  Such a person at the time of full reception, must make a profession of faith, be confirmed, and receive Eucharist (RCIA #409).

1.) an unbaptized person who is preparing to join the Catholic Church. The word "catechumen" comes from Greek and means "one who is being instructed." 

CCC 1248b: " The Catechumens should be properly initiated into the mystery of salvation and the practice of the evangelical virtues, and they should be introduced into the life of faith, liturgy, and charity of the People of God by successive sacred rites.[1]"

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[1]  Ad gentes 14; cf. RCIA 19:98

1.) The formation of the catechumens whose aim it is to bring them to conversion, respond to the divine initiative and in union with the ecclesial community.[1] 

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[1]  CCC 1248

(countable and uncountable) according to Roman Catholic canon law; the making of a putative marriage valid following the removal of some impediment (such as an annulment). it is marked by a rite in which a civil marriage, is made recognized by the church. 

Coming from the Latin it means "to firm up" or "to strengthen." A convalidation is a rite (or as you may, a religious ceremony) for a Catholic couple to be legally wed under Canon law. 

[ see Transformation ]

[ see Holy Communion ]

This the first period of the Catechumenal process. It is also known as the period of evangelization. The candidates are introduce to Christ by: 

(a) proclaiming the "living God and Jesus Christ whom he has sent for the salvation of all" (RCIA 36), 

(b) "a suitable explanation of the Gospel" (RCIA 38), 

(c) an opportunity for the beginnings of faith (RCIA 37).

An efficacious sign of grace, instituted by Christ and entrusted to the Church, by which divine life is dispensed to us through the work of the Holy Spirit.[1] The sacraments given to us by Christ are seven: Baptism, Confirmation, Eucharist, Penance or Reconciliation, Anointing of the Sick, Holy Orders, and Matrimony.[2]

The sacraments are referred to as "mysteries" in the Eastern Churches. This comes from the Greek Mysterion which is then rendered in the Latin as sacramentum and mysterium. The term   emphasizes the visible sign of the hidden reality of salvation therein contained in the mystery of the sacrament.[3]

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1.) CCC 774, CCC 1131

2.) CCC 1210

3.) CCC 774, CCC 1075 

From the the seven sacraments offered by the Church, the sacraments of initiation are: Baptism, Confirmation and Holy Communion.

See Also: RCIA Lesson 10 on Baptism
RCIA Lesson 12 on Confirmation
RCIA Lesson 19 on The Holy Eucharist

The willful process to submit to change. Within the context of spirituality and a relationship with God involves seeking to listen to God and follow His will. This in turn brings change or transformation. Another word for transformation is conversion. Transformation/conversion is an on going process through a way of life lived as a Christian. The transforming power is God's grace. None of this occurs without our free will cooperating with and submitting to God's will.

Transformation/Conversion is not for the for the sake of change. Nor is it necessarily the idea of improving oneself. It is yielding to be drawn closer to God. Transformation is done with the help of the Sacraments which allows for our sanctification. One of the consequences is a better version of ourselves. But that is only seen through the eyes of God.

God the Father, God the Son and God the Holy Spirit.