Adverb
In a principal manner; primarily; above all; chiefly; mainly.
Source: Webster's dictionaryI worked as a lawyer; as a member of the teaching staff of a technical college; and then I worked principally as legal adviser to Adolf Hitler and the National Socialist German Workers Party. Hans Frank
The evil effect of science upon men is principally this, that by far the greatest number of those who wish to display a knowledge of it accomplish no improvement at all of the understanding, but only a perversity of it, not to mention that it serves most of them as a tool of vanity. Immanuel Kant
Principally I hate and detest that animal called man; although I heartily love John, Peter, Thomas, and so forth. Jonathan Swift
Laughter is the sensation of feeling good all over and showing it principally in one place. Josh Billings
Can desire grow out of admiration, or are the two quite distinct species? What would it be like to lie side by side, naked, breast to breast, with a woman one principally admires? J. M. Coetzee
All religions are cruel, all founded on blood; for all rest principally on the idea of sacrifice - that is, on the perpetual immolation of humanity to the insatiable vengeance of divinity. Mikhail Bakunin