Fundamental

(Other definitions for basic that I've seen before include "At the lowest level" , "Staple; ordinary" , "Fundamental; alkaline" , "Simple form of language" , "Fundamental, forming a starting-point" .)

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

(Other definitions for prime that I've seen before include "Maybe eleven" , "Number such as two, three, five, seven, etc" , "Prepare for use, say a pump" , "Main; make usable" , "Capital - of first importance" .)

(Other definitions for central that I've seen before include "Near the middle" , "Key" , "Focal" , "Every answer here has one such letter" , "like this answer" .)

(Other definitions for element that I've seen before include "of the weather" , "Eg, one dn" , "He or I maybe" , "Iron, for instance - part of an electric kettle" , "Comfort zone" .)

(Other definitions for natural that I've seen before include "pure" , "Uncultivated" , "Unaffected - musical character" , "Accidental" , "Unaffected or earthy" .)

(Other definitions for essence that I've seen before include "A thing's intrinsic nature" , "Vital element" , "Concentration; nub" , "Characteristic nature" , "Perfume or concentrate" .)

(Other definitions for opinion that I've seen before include "school of thought" , "Personal belief or judgment" , "Estimation" , "Conviction - point of view" , "Personal view" .)

(Other definitions for initial that I've seen before include "First home, corgi, ultimately, wagging tail" , "First - opening" , "shortened version of my name" , "Start of name" , "Primary" .)

(Other definitions for capital that I've seen before include "Havana, say" , "It's jolly good in the great city" , "Cardinal; splendid; assets" , "Finances" , "Block" .)

(Other definitions for radical that I've seen before include "Drastic or thorough as changes may be" , "Progressive; extreme" , "Going to the roots, fundamental as change may be" , "Dial car in order to be drastic" , "Holding extreme political views" .)

(Other definitions for theorem that I've seen before include "Formula to be proved" , "mathematical achievement" , "Logical proposition" , "Proof" , "A rule in algebra" .)

(Other definitions for sublime that I've seen before include "Of the most exalted or noble kind" , "Glorious; supreme" , "Magnificent" , "Unparalleled, extreme" , "Exalted; awesome" .)

(Other definitions for ancient that I've seen before include "Historic standard" , "Very old, like the poetic mariner" , "Very old, like some civilizations" , "of long standing" , "Antediluvian" .)

(Other definitions for organic that I've seen before include "sort of farming" , "The sort of crop" , "Fundamental" , "No cigar (anag.)" , "Biological" .)

(Other definitions for minimal that I've seen before include "Very little" , "Very small, the least possible (7)" , "Of a smallest amount" , "Of the least possible size" , "Least possible; negligible" .)

(Other definitions for needful that I've seen before include "Nude elf (anag.)" , "Necessary for nude elf" , "Required" , "Poverty-stricken" , "poor" .)

(Other definitions for precept that I've seen before include "order for payment of rate" , "Rule or principle" , "Rule of action" , "Rule of conduct or command" , "Moral rule" .)

(Other definitions for primary that I've seen before include "Principal" , "Main" , "Paramount" , "Of chief importance" , "The colours from which all others can be made" .)

(Other definitions for virtual that I've seen before include "Being almost the same" , "Existing in essence" , "Cyberspace type of reality" , "to all intents and purposes" , "In effect, but not in fact" .)

(Other definitions for lurking that I've seen before include "Waiting in ambush" , "Lying hidden in ambush" , "Lying in wait, ready to ambush perhaps" , "Skulking" , "In hiding for ambush" .)

(Other definitions for crucial that I've seen before include "Pivotal" , "Of great importance" , "Of critical importance, decisive" , "Decisive - very important" , "Of paramount importance" .)

(Other definitions for feature that I've seen before include "Special attraction" , "Focal point" , "Principal film or special article" , "Trait" , "Principal film or non-news article" .)

(Other definitions for ultimate that I've seen before include "Last possible, final" , "Mutilate in last possible way" , "Last, final or extreme" , "Best - last" , "Utmost; last" .)

(Other definitions for evidence that I've seen before include "Information in a law case" , "Confirmation" , "Facts on which to establish verdict" , "What scientists need" , "Information to help form a conclusion" .)

(Other definitions for cardinal that I've seen before include "papal adviser" , "Prince of the Roman Catholic Church" , "Possibly one" , "Most important number" , "first" .)

(Other definitions for basement that I've seen before include "space below stairs" , "Room at the bottom" , "Floor below ground level" , "room's full!" , "low point" .)

(Another definition for littlest that I've seen is " very small".)

(Other definitions for backbone that I've seen before include "Spine or courage" , "Firmness of character" , "Spinal column courage" , "Informal courage of spinal kind" , "Lt protects the spinal cord" .)

(Other definitions for rudiment that I've seen before include "Fundamental principle" , "First principle" , "Basic form of something" , "stage at the start" , "Basic principle" .)

(Another definition for empyreal that I've seen is " heavenly!".)

(Other definitions for integral that I've seen before include "Altering so as to be necessary to the whole" , "Maths function; whole" , "Belonging as an essential part" , "Built-in -- 1 across (anag)" , "A component and indispensable part of, like triangle" .)

(Other definitions for standard that I've seen before include "Grade" , "Ordinary Level?" , "Basic criterion" , "Normal quality" , "Level of quality; flag" .)

(Other definitions for critical that I've seen before include "essential" , "Looking for faults, like reviewer?" , "At crucial stage, or being disparaging" , "expressing disapproving comments" , "Crucial, decisive" .)

(Other definitions for empyrean that I've seen before include "Relating to heaven" , "May preen about the celestial vault" , "Rap enemy under celestial vault" , "The celestial vault or firmament" , "Sublime; the highest heaven (arch.)" .)

(Other definitions for earliest that I've seen before include "Original or most previous" , "Soonest" , "Nearest the beginning in time" , "Arriving first" , "The first to arrive - to get the worm?" .)

(Other definitions for original that I've seen before include "First; (an) odd character" , "- - sin" , "Novel - archetype" , "Not an imitation, the first" , "Pristine; innovative" .)

(Other definitions for absolute that I've seen before include "Sheer, total, not limited" , "Peremptory" , "Total, utter" , "Despotic" , "sure" .)

(Other definitions for material that I've seen before include "Important; fabric" , "Matter; cloth" , "Preoccupied with physical, rather than spiritual, substance" , "Tangible substance" , "Constituents" .)

(Other definitions for inherent that I've seen before include "Necessary as a part" , "Existing permanently in something" , "Basic" , "Integral, inbuilt" , "deep-rooted" .)

(Other definitions for doctrine that I've seen before include "On credit (anag.)" , "Dogma" , "No credit given to belief" , "Article of faith" , "Set of beliefs taught by church" .)

(Other definitions for staple that I've seen before include "(Of food) necessary and important" , "Paper fastener - basic foodstuff" , "security device" , "means of keeping papers together" , "Paper pin for plates" .)

(Other definitions for primal that I've seen before include "typifying some fear?" , "Having existed from the beginning" , "From a very early time" , "Relating to an early stage of evolution" , "Most important (scream therapy?)" .)

(Another definition for underlying that I've seen is " Basic".)