the mean of けれども is : but ; though; although; however , and is same mean like けれど and it's particle of coordinate

けれども has a meaning of "but (yet)", "however" or "although", as seen in, http://www.wordreference.com/jaen/%E3%81%91%E3%82%8C%E3%81%A9%E3%82%82%20 It is not a particle, but rather a conjunction or an adverb. --- 良い 一日を。/ Good day.