Veda (v. Samskrit, root: vid) meaning "to know". So veda means knowledge" or "wisdom."
The Vedas (n) are the most ancient Hindu and yogic texts. It is believed that the texts were revealed to the ancient sages who passed them on orally (shrutis, what is heard). It consists of 3 section - Karma Kanda, Jnana Kanda and Upasana Kanda.
Veda Vyasa compiled the Vedas into four Rig, Yajur, Sama & Atharva Veda.
Indian philosophical systems are classified into 6 school of thoughts (ṣaḍ-darśana) viz. Mimamsa (Purva Mimamsa), Samkhya, Yoga, Nyaya, Vaisheshika and Vedanta (Uttara Mimamsa). Vedanta school of philosophy takes its teachings from the Upanishads, the final section of the literature of the Vedas. It also draws upon the Bhagavad Gita, the Brahma Sutras as well as ideas from yogic philosophy and Nyaya.
Vedanta comes from 2 words: Veda - knowledge and anta - end. So it means "the end goal of Vedic (pertaining to Veda) literature."
The core teaching of Vedanta is to experience one's true nature: the individual soul as a part of the universal or supreme Soul.
The term can also be used to denote someone who has mastered the original four Vedas. Scholars quoting Vedanta philosophy are called vedantin.
वैदिक (Vaidika / Vedic)
May be used to refer to literature of Vedas (vedic scriptures), or occuring in era when Vedas were composed (vedic period) or refer to dharma propounded by Vedas - the four disciplines (asrama) of followers.