Yes, . Most modern anime seasons run 12-24 episodes. Gintama Season 1 ran for four consecutive cours (one full year followed by another). So, when we say "Season 1," we are referring to Episodes 1 through 49 (the first major story arc) or, in broader terms, the entire 2006-2010 run.
, it originally aired on TV Tokyo between April 2006 and March 2007. Plot & Setting gintama season 1 link
: The official home for Gintama, offering the full series with subtitles and dubbed versions in many regions. when we say "Season 1