What's the difference between oppose and oppugn?

Oppose

Definition:

(n.) To place in front of, or over against; to set opposite; to exhibit.
(n.) To put in opposition, with a view to counterbalance or countervail; to set against; to offer antagonistically.
(n.) To resist or antagonize by physical means, or by arguments, etc.; to contend against; to confront; to resist; to withstand; as, to oppose the king in battle; to oppose a bill in Congress.
(n.) To compete with; to strive against; as, to oppose a rival for a prize.
(v. i.) To be set opposite.
(v. i.) To act adversely or in opposition; -- with against or to; as, a servant opposed against the act.
(v. i.) To make objection or opposition in controversy.

Example Sentences:

(1) A study revealed that the percentage of active sperm in semen 30 seconds after ejaculation was 10.3% when a nonoxynol 9 latex condom was used as opposed to 55.9% in a nonspermicidal condom.
(2) Biden will meet with representatives from six gun groups on Thursday, including the NRA and the Independent Firearms Owners Association, which are both publicly opposed to stricter gun-control laws.
(3) The results indicated that smoke, as opposed to sham puffs, significantly reduced reports of cigarette craving, and local anesthesia significantly blocked this immediate reduction in craving produced by smoke inhalation.
(4) 3) The magnitude of K+ release is the ratio of two opposing mechanisms, a passive efflux and an active reuptake.
(5) We are firmly opposed to that," an unidentified spokesman from the ministry of industry and information technology told the state news agency, Xinhua.
(6) Each axon had a characteristic head position which was maximally excitatory to it, and a diametrically opposed head position which was minimally excitatory.3.
(7) As opposed to the other tests for LPD, awareness of the usefulness of the biopsy has increased as we have learned more about CL physiology.
(8) Strict fundamentalists oppose music in any form as a sensual distraction - the Taliban, of course, banned music in Afghanistan.
(9) The interaction between PE and E-IgG involved the extension of micropseudopods toward adherent E-IgG, the formation of a linear uniform cap of roughly 200 A between opposing cell membranes, the ingestion of E-IgG by PE into a membrane-lined compartment, and the disintegration of the ingested ligand into membranous debris.
(10) It is contended that the latter is the main factor in its production as opposed to the more common external rotation variety.
(11) Loyalists are opposed to any restrictions and have blocked roads and rioted over the issue.
(12) But today, Americans increasingly no longer shy away from saying they oppose mosques on the grounds that Muslims are a threat or different.
(13) In contrast, large territories may reflect widespread motor-unit actions, advantageous in force development where fine movement control is less important, as in biting in the intercuspal position or opposing gravity.
(14) Burns has a successful track record of opposing fees.
(15) Protesting naked, as Femen's slogans insist, is liberté , a reappropriation of their own bodies as opposed to pornography or snatched photographs which are exploitation.
(16) And in terms of genuine defence needs (as opposed to state militarism), what greater known threat is there to human security than the prospect of runaway climate change?
(17) As opposed to nifedipine charybdotoxin shows no effect if added 18 h after the initiation of the activation process.
(18) RR spectra of fatty acyl-CoA and its complexes are consistent with the previous hypothesis that visible spectral shifts observed during formation of acetoacetyl-CoA and crotonyl-CoA complexes of fatty acyl-CoA dehydrogenase result from charge-transfer interactions in which the ground state is essentially nonbonding as opposed to interactions in which complete electron transfer occurs to form FAD semiquinone.
(19) The remarks are the most direct official response on the issue, although the government has previously said that it "resolutely opposes" hacking and criticised "baseless" claims.
(20) A lawyer advising one of the newspaper groups opposing the deal said: "All the regulator has to prove is that there is a potential for a reduction in plurality in the UK.