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Definitions

adjuvant

[aj-uh-vuhnt] / ˈædʒ ə vənt /

ADJECTIVE

ancillary

Synonyms

STRONGEST

additional

WEAK

accessory accompanying appurtenant attendant attending coincident collateral concomitant contributory incident satellite secondary subordinate subservient subsidiary

Antonyms

WEAK

necessary needed

ADJECTIVE

auxiliary

Synonyms

STRONGEST

ancillary

STRONG

accessory backup complementary extra reserve secondary spare subordinate subsidiary supporting

WEAK

abetting appurtenant contributory subservient

Antonyms

STRONG

chief important necessary superior

WEAK

body main

ADJECTIVE

collateral

Synonyms

STRONGEST

ancillary

STRONG

accessory attendant auxiliary complementary concomitant coordinate dependent incident lateral parallel roundabout satellite side sub subordinate subsidiary supporting tributary

WEAK

accompanying added adjunctive appurtenant circuitous coincident concurrent confirmatory corresponding corroborative not lineal related subservient under

Antonyms

STRONG

chief different dissimilar important independent major necessary unrelated

WEAK

direct main primary principal

ADJECTIVE

concomitant

Synonyms

STRONG

accessory attendant attending belonging coefficient coeval collateral complementary contemporary coordinate corollary fellow incident joint satellite

WEAK

agreeing ancillary associated with associative coetaneous coexistent coincident coincidental concordant concurrent conjoined conjoined with connected contemporaneous coterminous coupled with in tempo in time isochronal isochronous synchronal synchronous synergetic synergistic

Antonyms

WEAK

accidental chance unrelated

ADJECTIVE

subordinate

Synonyms

STRONG

accessory auxiliary collateral dependent inferior junior low lower minor satellite secondary sub subaltern subject subnormal subsidiary tributary

WEAK

ancillary baser below par contributory insignificant paltry second-fiddle second-string smaller subalternate submissive subservient substract under underaverage unequal

Antonyms

STRONG

chief first-class first-rate important main primary source strong superior

WEAK

major necessary vital

ADJECTIVE

subservient

Synonyms

STRONGEST

inferior

WEAK

accessory ancillary appurtenant auxiliary bush-league collateral conducive contributory helpful instrumental minor serviceable subordinate subsidiary supplemental supplementary

Antonyms

WEAK

controlling domineering unhelpful unnecessary useless

ADJECTIVE

subsidiary

Synonyms

STRONGEST

ancillary supplementary

STRONG

accessory assistant auxiliary backup branch collateral cooperative minor subject subordinate

WEAK

aiding appurtenant assisting contributory lesser serviceable subservient supplemental tributory useful

Antonyms

STRONG

chief main major

WEAK

important necessary

ADJECTIVE

supportive

Synonyms

WEAK

abetting accessory ancillary appurtenant assistant backup collateral complementary contributory extra reserve secondary spare subordinate subservient subsidiary supporting

NOUN

catalyst

Synonyms

STRONGEST

impetus incentive motivation stimulant

STRONG

agitator enzyme goad impulse incendiary incitation incitement reactant reactionary spur synergist

WEAK

radical stimulus spark plug wave maker

Antonyms

STRONGEST

block hindrance

WEAK

blockage preventer prevention

NOUN

leavening

Synonyms

STRONG

agitator enzyme ferment goad impetus impulse incendiary incentive incitation incitement leaven motivation reactant reactionary spur stimulant synergist yeast

WEAK

radical stimulus spark plug wave maker

Antonyms

STRONG

block discouragement hindrance

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Moving forward, the analyst plans to monitor other data readouts, including the results of two trials evaluating the efficacy of intismeran alone in patients with renal cell carcinoma and as an adjuvant therapy for melanoma.

From Barron's • May 8, 2026

Nevertheless, negative results for breast cancer drug candidate giredestrant as a first-line treatment mean the majority of its opportunity is in the so-called adjuvant setting, when drugs are given after tumor-removal surgery, the analysts add.

From The Wall Street Journal • Mar. 12, 2026

Vaccines -- regardless the target disease -- contain two primary components: The antigen and the adjuvant.

From Science Daily • Oct. 13, 2025

We did look at developing an mRNA vaccine for rhinoviruses, but in the end, we decided to go with a protein vaccine with an adjuvant.

From Slate • Oct. 8, 2025

I ordered him the baths, without any adjuvant treatment whatsoever.

From The Electric Bath by Schweig, George M.

adjuvant

Example Sentences

Related Words