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essential
basic and fundamental
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all important, all-important, crucial, essential, of the essence
of the greatest importance
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alpha
first in order of importance
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beta
second in order of importance
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big
significant
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burning
of immediate import
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cardinal, central, fundamental, key, primal
serving as an essential component
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chief, main, master, primary, principal
most important element
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consequential, eventful
having important issues or results
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Copernican
of radical or major importance
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distinguished
(used of persons) standing above others in character or attainment or reputation
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grand
the most important and magnificent in adornment
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grave, grievous, heavy, weighty
of great gravity or crucial import; requiring serious thought
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great, outstanding
of major significance or importance
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historic
important in history
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in-chief
indicating the head of a staff
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measurable
of distinguished importance
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most-valuable
designating the player judged to be the most important to the sport
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serious
of great consequence
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strategic
highly important to or an integral part of a strategy or plan of action especially in war
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important, significant
important in effect or meaning
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valuable
having great material or monetary value especially for use or exchange