Adjective

(en adjective)

Being essential or decisive for determining the outcome or future of something; extremely important.

*{{quote-magazine, date=2014-03-07, author= Nicole Vulser

, volume=190, issue=13, page=30, magazine=(The Guardian Weekly) , title= Perfume manufacturers must cope with the scarcity of precious supplies , passage=The perfume industry is facing a major problem: maintaining constant levels of quality is crucial , but it is increasingly difficult to obtain a regular supply of all the necessary natural ingredients.}}

(label) Cruciform or cruciate; cross-shaped.

Term of approval, particularly when applied to reggae music.

Adjective

(head)

of, or relating to a foundation or foundations

fundamental or underlying