Synonyms of the word

fundamental

• n. (usually in the plural) A leading or primary principle, rule, law, or article, which serves as the groundwork…
• n. (physics) The lowest frequency of a periodic waveform.
• n. (music) The lowest partial of a complex tone.
• adj. Pertaining to the foundation or basis; serving for the foundation.
• adj. Essential, as an element, principle, or law; important; original; elementary.

basic

• adj. Necessary, essential for life or some process.
• adj. Elementary, simple, fundamental, merely functional.
• adj. (chemistry) Of or pertaining to a base; having a pH greater than 7.
• adj. (slang) Unremarkable or uninteresting; boring; uncool.
• n. A necessary commodity, a staple requirement.
• n. An elementary building block, e.g. a fundamental piece of knowledge.
• n. (military) Basic training.

cardinal

• adj. Of fundamental importance; crucial, pivotal.
• adj. (nautical) Of or relating to the cardinal directions (north, south, east and west).
• adj. Describing a "natural" number used to indicate quantity (e.g., one, two, three), as opposed to an ordinal…
• adj. Having a bright red color (from the color of a Catholic cardinal's cassock).
• n. A number indicating quantity, or the size of a set, e.g., one, two, three. (See Wikipedia article on Cardinal…
• n. (grammar) A word used to represent a cardinal number; a cardinal numeral.
• n. An official in the Catholic Church, ranking only below the Pope and the patriarchs. (See Wikipedia article…
• n. Any of a genus of songbirds of the finch family, Cardinalis.
• n. Any of various related passerine birds of the family Cardinalidae (See Wikipedia article on cardinals)…
• n. A shade of scarlet, the traditional colour of a Catholic cardinal's cassock.
• n. (historical) A woman's short cloak with a hood.
• n. (obsolete) Mulled red wine.
• n. A freshwater fish, the cardinal tetra (Paracheirodon axelrodi).

central

• adj. Being in the centre.
• adj. Being the most important.
• adj. Having or containing the centre of something.
• adj. Being very important, or key to something.
• adj. (anatomy) Exerting its action towards the peripheral organs.

harmonic

• adj. pertaining to harmony.
• adj. pleasant to hear; harmonious; melodious.
• adj. (mathematics) used to characterize various mathematical entities or relationships supposed to bear some…
• n. (physics) a component frequency of the signal of a wave that is an integer multiple of the fundamental…
• n. (music) the place where, on a bowed string instrument, a note in the harmonic series of a particular string…

important

• adj. Having relevant and crucial value.

key

• n. An object designed to open and close a lock.
• n. An object designed to fit between two other objects (such as a shaft and a wheel) in a mechanism and maintain…
• n. A crucial step or requirement.
• n. A guide explaining the symbols or terminology of a map or chart; a legend.
• n. A guide to the correct answers of a worksheet or test.
• n. (computing) One of several small, usually square buttons on a typewriter or computer keyboard, mostly…
• n. (music) One of a number of rectangular moving parts on a piano or musical keyboard, each causing a particular…
• n. (music) One of various levers on a musical instrument used to select notes, such as a lever opening a…
• n. (music) A hierarchical scale of musical notes on which a composition is based.
• n. (figuratively) The general pitch or tone of a sentence or utterance.
• n. (botany) An indehiscent, one-seeded fruit furnished with a wing, such as the fruit of the ash and maple;…
• n. (historical) A manual electrical switching device primarily used for the transmission of Morse code.
• n. (cryptography) A piece of information (e.g. a passphrase) used to encode or decode a message or messages.
• n. (Internet) A password restricting access to an IRC channel.
• n. (databases) In a relational database, a field used as an index into another table (not necessarily unique).
• n. (computing) A value that uniquely identifies an entry in an associative array.
• n. (basketball) The free-throw lane together with the circle surrounding the free-throw line, the free-throw…
• n. (biology) A series of logically organized groups of discriminating information which aims to allow the…
• n. (architecture) A piece of wood used as a wedge.
• n. (architecture) The last board of a floor when laid down.
• n. (masonry) A keystone.
• n. That part of the plastering which is forced through between the laths and holds the rest in place.
• n. (rail transport) A wooden support for a rail on the bullhead rail system.
• n. (heraldry) The object used to open or close a lock, often used as a heraldic charge.
• n. The degree of roughness, or retention ability of a surface to have applied a liquid such as paint, or…
• adj. Indispensable, supremely important.
• adj. Important, salient.
• v. To fit (a lock) with a key.
• v. To fit (pieces of a mechanical assembly) with a key to maintain the orientation between them.
• v. To mark or indicate with a symbol indicating membership in a class.
• v. (telegraphy and radio telegraphy) To depress (a telegraph key).
• v. (radio) To operate (the transmitter switch of a two-way radio).
• v. (computing) (more usually to key in) To enter (information) by typing on a keyboard or keypad.
• v. (colloquial) To vandalize (a car, etc.) by scratching with an implement such as a key.
• v. To link (as one might do with a key or legend).
• v. (intransitive, biology, chiefly taxonomy) To be identified as a certain taxon when using a key.
• v. To fasten or secure firmly; to fasten or tighten with keys or wedges.
• n. One of a string of small islands.
• n. Alternative form of quay.
• n. (slang) Clipping of kilogram. (though this is more commonly shortened to kay).

primal

• adj. Being the first in time, or history.
• adj. Being of greatest importance; primary.
• adj. (meat trade) Being one of the pieces of meat initially separated from the carcass during butchering, prior…
• n. primal cut (of meat).

profound

• adj. Descending far below the surface; opening or reaching to great depth; deep.
• adj. Very deep; very serious.
• adj. Intellectually deep; entering far into subjects; reaching to the bottom of a matter, or of a branch of…
• adj. Characterized by intensity; deeply felt; pervading.
• adj. Bending low, exhibiting or expressing deep humility; lowly; submissive.
• n. (obsolete) The deep; the sea; the ocean.
• n. (obsolete) An abyss.
• v. (obsolete) To cause to sink deeply; to cause to dive or penetrate far down.
• v. (obsolete) To dive deeply; to penetrate.

rudimentary

• adj. Of or relating to one or more rudiments.
• adj. Basic; minimal; with less than, or only the minimum, necessary.
• n. (zoology, usually in the plural) One of the rudimentary mammae of boars.

significant

• adj. Signifying something; carrying meaning.
• adj. Having a covert or hidden meaning.
• adj. Having a noticeable or major effect; notable.
• adj. Reasonably large in number or amount.
• adj. (statistics) Having a low probability of occurring by chance (for example, having high correlation and…
• n. That which has significance; a sign; a token; a symbol.

underlying

• adj. lying underneath.
• adj. basic or fundamental.
• adj. implicit.
• n. (finance) The entity from whose performance a derivative derives its value.