Essential (5)

(Other definitions for vital that I've seen before include "Essential for life; key" , "Absolutely necessary or life-giving" , "Critical, necessary" , "Most important, like certain body organs" , "Are such statistics" .)

(Other definitions for state that I've seen before include "eg Alaska" , "See 18" , "Say; country" , "Condition - sovereign political power" , "Declare - political unit" .)

(Other definitions for acute that I've seen before include "Discerning" , "Excruciating" , "Grave" , "Severe, penetrating" , "Extremely sharp or intense" .)

(Other definitions for first that I've seen before include "Initial" , "Preceding all others" , "Coming before all others" , "Premier (except in football!)" , "in dominant position" .)

(Other definitions for ideal that I've seen before include "Perfect but perhaps unlikely to become reality" , "Model of ethical behaviour" , "without flaws" , "Coal-mining waste" , "Embodying perfection" .)

(Other definitions for prime that I've seen before include "Fundamental - of highest quality" , "(Of number) divisible only by itself and one" , "At least two" , "Monastic service; best quality" , "Best - get ready" .)

(Other definitions for major that I've seen before include "Very significant - army officer" , "Pre-eminent" , "Important - ex-PM" , "Leading - ex-Prime Minister" , "Of great importance" .)

(Other definitions for grand that I've seen before include "great distinction" , "Large and imposing" , "Imposing; PS1,000" , "1,000 GBP" , "GBP1,000" .)

(Other definitions for genes that I've seen before include "Units of DNA" , "Factors governing heredity, carried by chromosome" , "Units of heredity" , "Biological factors controlling heredity" .)

(Other definitions for heavy that I've seen before include "Oppressive" , "Not light" , "Mosque prayer leader" , "Hard to lift" , "Difficult to lift" .)

(Other definitions for basal that I've seen before include "At the lowest level" , "bottom layer perhaps" , "Fundamental" , "forming a foundation" .)

(Other definitions for heart that I've seen before include "It beats" , "Core, courage" , "Core - card" , "the name of a prison in Midlothian!" , "Pumping organ" .)

(Other definitions for usual that I've seen before include "Expected" , "In accordance with regular practice" , "Standard" , "Unexceptional" , "Customary - customary drink" .)

(Other definitions for basis that I've seen before include "Foundation of a theory or process" , "Fundamental part" , "Underlying support (for an idea)" , "First principle" , "Reason" .)

(Other definitions for inner that I've seen before include "red" , "Not quite bull's-eye" , "Nearer the middle" , "Target area" , "closer than magpie" .)

(Other definitions for necessary that I've seen before include "obligatory" , "Fundamental" , "Indispensable, essential" , "Required to be done" , "Absolutely essential" .)

(Other definitions for intrinsic that I've seen before include "Belonging as an inherent and essential part" , "native?" , "Natural" , "Genuine" , "Belonging by its very nature" .)

(Other definitions for imperative that I've seen before include "Obligatory" , "Urgently necessary" , "Requiring attention" , "Of vital importance, commanding" , "Extremely important" .)