n.

1. Hostility that results in active resistance, opposition, or contentiousness. See synonyms at enmity.
2. The condition of being an opposing principle, force, or factor: the inherent antagonism of capitalism and socialism.
3. Biochemistry. Interference in the physiological action of a chemical substance by another having a similar structure.

noun

1. Deep-seated hatred, as between longtime opponents or rivals: animosity, animus, antipathy, enmity, hostility, ill will. See love/hatred.
2. The condition of being in conflict: antithesis, contradiction, contradistinction, contraposition, contrariety, contrariness, opposition, polarity. See support/oppose.

n

Definition: cause of problem; opposition
Antonyms: accord, agreement, harmony, rapport, sympathy, understanding

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1. opposition or contrariety between similar things, as between muscles, medicines or organisms, cf. antibiosis; the characteristic displayed by an antagonist.
2. epidemiologically speaking, the opposite of synergism. When the combined effects of two factors is smaller than the effect of any one of them.

• antibiotic a. — is said to occur when the antibiotic effect of a dual administration is less than the antibiotic efficiency of the most effective of the individual drugs. Chloramphenicol and tetracyclines are considered to be antagonists to penicillins and aminoglycosides but particular combinations do not necessarily have the same effect on all bacteria.
• competitive a. — the antagonism which blocks or reverses the effects of an agonist, provided that the antagonist is given at an appropriate dosage. The antagonism is completely reversible, and an increase in the biophasic concentration of the agonist will overcome the effect of the antagonist.
• drug a. — drug antagonists are drugs that compete for the available receptors. They may be noncompetitive and have no pharmacological effect of their own, or competitive in that they are capable of reversing or altering an effect already achieved.
• noncompetitive a. — is when the antagonist removes the receptor or its response potential from the system; this may be by preventing the agonist from producing its effect at a receptor site by irreversible change to the receptor or its capacity to respond. The antagonism is not reversible by increasing the concentration of the agonist.

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Dansk (Danish)
n. - antagonisme, fjendskab, modstrid

Nederlands (Dutch)
vijandigheid, tegenstand

Français (French)
n. - antagonisme

Deutsch (German)
n. - Feindseligkeit

Ελληνική (Greek)
n. - ανταγωνισμός, αντιπαλότητα

Italiano (Italian)
antagonismo

Português (Portuguese)
n. - antagonismo (m), hostilidade (f)

Русский (Russian)
антагонизм, вражда

Español (Spanish)
n. - antagonismo, hostilidad, oposición, contienda

Svenska (Swedish)
n. - motstånd, motsättning

中文（简体） (Chinese (Simplified))
对抗, 敌意, 对立, 敌对, 对抗力量

中文（繁體） (Chinese (Traditional))
n. - 對抗, 敵意, 對立, 敵對, 對抗力量

한국어 (Korean)
n. - 적대[심]

日本語 (Japanese)
n. - 敵対, 対立, 敵意

العربيه (Arabic)
‏(الاسم) خصومه, عدا‏

עברית (Hebrew)
n. - ‮ניגוד, איבה‬

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