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Existing, happening, or done, at the same time; as, simultaneous events. -- Si`mul*ta"ne*ous*ly, adv. -- Si`mul*ta"ne*ous*ness, n. Simultaneous equations (Alg.), two or more equations in which the values of the unknown quantities entering them are the same at the same time in both or in all.

Private grudge or quarrel; as, domestic simulties. [Obs.] B. Jonson.

Old form of Since. [Obs. or Prov.Eng. & Scot.] Sin that his lord was twenty year of age. Chaucer.

Of or pertaining to Mount Sinai; given or made at Mount Sinai; as, the Sinaitic law. Sinaitic manuscript, a fourth century Greek manuscript of the part Bible, discovered at Mount Sinai (the greater part of it in 1859) by Tisschendorf, a German Biblical critic; -- called also Codex Sinaiticus.

A glucoside found in the seeds of white mustard (Brassica alba, formerly Sinapis alba), and extracted as a white crystalline substance.

A bitter white crystalline nitrogenous substance, obtained indirectly from oil of mustard and ammonia; -- called also allyl melamine.

A salt of sinapic acid.

Of or pertaining to sinapine; specifically, designating an acid (C11H12O5) related to gallic acid, and obtained by the decomposition of sinapine, as a white crystalline substance.

ith sulphocyanic acid, as a white crystalline substance, having a hot, bitter taste. When sinapine is isolated it is unstable and undergoes decomposition.

A disused generic name for mustard; -- now called Brassica.

A substance extracted from mustard seed and probably identical with sinalbin. [Obs.]

A plaster or poultice composed principally of powdered mustard seed, or containing the volatile oil of mustard seed. It is a powerful irritant.

Of or pertaining to mustard oil; specifically, designating an acid of the oleic acid series said to occur in mistard oil.

A nitrogenous base, CO.(NH.C3H5)2, related to urea, extracted from mustard oil, and also produced artifically, as a white crystalline substance; -- called also diallyl urea.

Choline. [Written also sinkaline.]

From a definite past time until now; as, he went a month ago, and I have not seen him since. We since become the slaves to one man's lust. B. Jonson.

Pure; unmixed; unadulterated. There is no sincere acid in any animal juice. Arbuthnot. A joy which never was sincere till now. Dryden.

In a sincere manner. Specifically:

Same as Sincerity. Beau & Fl.

The quality or state of being sincere; honesty of mind or intention; freedom from simulation, hypocrisy, disguise, or false pretense; sincereness. I protest, in the sincerity of love. Shak. Sincerity is a duty no less plain than important. Knox.