To rule over or control arbitrarily or arrogantly; to tyrannize.

Of or pertaining to Jesus Christ as Lord. / (rare) Pertaining to the Lord's Day, Sunday.

(obsolete) Sunday. / (obsolete) The Lord's Prayer.

Ruling; governing; prevailing / Predominant, common, prevalent, of greatest importance.

(music) The fifth major tone of a musical scale (five major steps above the note in question); thus G is the dominant of C, A of D, and so on. / (music) The triad built on the dominant tone.

Control by means of superior ability, influence, position, or resources; prevailing force. / The exercise of power in ruling; sovereignty; authority; government.

To govern, rule or control by superior authority or power / To exert an overwhelming guiding influence over something or someone / To enjoy a commanding position in some field

Dominant.

(historical) The late period of the Roman Empire, following the principate, during which the emperor's rule became more explicitly autocratic and remaining vestiges of the Roman Republic were removed from the formal workings of government; the reign of any particular emperor during this period.

The state of being dominant; of prime importance; supremacy. / Being in a position of power, authority or ascendancy over others.