(US, Canada, education) To take (something) as one's major field of study in an institute of tertiary education (such as a college or university).

plural of Teran

Speed; swiftness; dispatch. / (obsolete) Urgency; sudden excitement of feeling or passion; precipitance; vehemence.

(theology) The essential nature or ‘substance’ of God, often as contrasted to the ‘energies’ (external actions and influences) through which he is manifest. / (philosophy) Essence, being.