Synonyms of the word

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.

considerable

• adj. Significant; worth considering.
• adj. Large in amount.
• n. (obsolete) A thing to be considered, consideration.

earthshaking

• adj. Of global consequence or importance.
• adj. Very loud.

epoch-making

• adj. Constituting an epoch; opening a new era; introducing new conceptions or a new method in the treatment…

epochal

• adj. of or pertaining to an epoch.
• adj. highly important or significant; monumentous, epoch-making.

evidential

• adj. Of or providing evidence.

evidentiary

• adj. (law) Of or pertaining to evidence.

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.

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).

large

• adj. Of considerable or relatively great size or extent.
• adj. (obsolete) Abundant; ample.
• adj. (archaic) Full in statement; diffuse; profuse.
• adj. (obsolete) Free; unencumbered.
• adj. (obsolete) Unrestrained by decorum; said of language.
• adj. (nautical) Crossing the line of a ship's course in a favorable direction; said of the wind when it is…
• n. (music, obsolete) An old musical note, equal to two longas, four breves, or eight semibreves.
• n. (obsolete) Liberality, generosity.
• n. (slang, plural: large) A thousand dollars/pounds.
• n. A large serving of something.

meaning

• n. The symbolic value of something.
• n. The significance of a thing.
• n. (semantics) The objects or concept that a word or phrase denotes, or that which a sentence says.
• n. (obsolete) Intention.
• v. present participle of mean.
• adj. Having a (specified) intention.
• adj. Expressing some intention or significance; meaningful.

meaningful

• adj. Having meaning, significant.

momentous

• adj. Outstanding in importance, of great consequence.

monumental

• adj. In the manner of a monument.
• adj. Large, grand and imposing. Fitting to be a monument to someone or something.
• adj. Taking a great amount of time and effort to complete.
• adj. (archaeology) Relating to monuments.

noteworthy

• adj. Deserving attention; notable; worthy of notice.
• n. A noteworthy person.

operative

• adj. Effectual or important.
• adj. Functional, in working order.
• adj. Having the power of acting; hence, exerting force, physical or moral; active in the production of effects.
• adj. Producing the appropriate or designed effect; efficacious.
• adj. Based upon, or consisting of, a surgical operation or operations.
• n. An employee or other worker with some particular function or skill.
• n. A spy, secret agent, or detective.
• n. A participant in an operation.

portentous

• adj. Of momentous or ominous significance.
• adj. Ominously prophetic.
• adj. Puffed up with vanity.

pregnant

• adj. (chiefly not comparable) Carrying developing offspring within the body.
• adj. (comparable) Having numerous possibilities or implications; full of promise; abounding in ability, resources,…
• adj. (now poetic) Fertile, prolific (usually of soil, ground etc.).
• adj. (obsolete) Affording entrance; receptive; yielding; willing; open; prompt.
• n. A pregnant woman.

probative

• adj. (law) Tending to prove a particular proposition or to persuade someone of the truth of an allegation.

probatory

• adj. Serving for trial; probationary.
• adj. Relating to, or serving for, proof.

prodigious

• adj. Very big in size or quantity; gigantic; colossal; huge.
• adj. extraordinarily exciting or amazing.
• adj. (obsolete) ominous, portentous.

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.

remarkable

• adj. Worthy of being remarked or noticed; noticeable; conspicuous; hence, uncommon; extraordinary.

substantial

• adj. Having a substance; actually existing.
• adj. Not seeming or imaginary; not illusive; real; solid; true; veritable.
• adj. Corporeal; material; firm.
• adj. Having good substance; strong; stout; solid; firm.
• adj. possessed of goods or an estate; moderately wealthy; responsible.
• adj. Large in size, quantity, or value; vastas.
• adj. Most important; essential.
• adj. Ample or full.
• adj. Significantly great.
• n. Anything having substance; an essential part.

world-shaking

• adj. Momentous; of great import; of great significance, importance or consequence.