Gayatri mantra has been bestowed the greatest importance in Veda. This mantra has also been termed as Ved mata Savitri and Ved-Mata, the mother of the Vedas.
“Om Bhur Bhuvah Swah, Tat Savitur Varenyam
Bhargo Devasya Dheemahi, Dhiya Yo Nah Prachodayat”

We meditate on that God’s (nature’s) glory, Who has created the universe….
God! You are Omnipresent, Omnipotent and Almighty.
You are all Light. You are all Knowledge and Bliss.
You are Destroyer of fear; You are Creator of this Universe,
You are the Greatest of all. We bow and meditate upon your light.
You guide our intellect in the right direction.

OM
Symbol of the Par Brahman

Bhur
Bhu-Loka (Physical plane)

Bhuvah
Antariksha-Loka (Astral plane)

Swah
Swarga-Loka (Celestial plane)

Tat
That; Transcendent Paramatman

Sa – vitur
Ishawara or Creator

Varenyam
Fit to be worshipped or adored

Bhargo
Remover of sins and ignorance; Glory Effulgence

Devasya
Resplendent; Shining

Dheemahi
We meditate

Dhiyo
Buddhis; Intellects; Understandings

Yo
Which; who

Nah
Our

Prachodayat
Enlighten; Guide.