What's are the steps in finding the meaning of an unknown word in text?

The three brothers began to altercate over the game.  This was not the first time that they argued over it.

Based on the context clues in the sentence below, ecstatic means: They were ecstatic at the birth of their baby.  They couldn't stop smiling for days. 

Based on context clues in the passage below, truncated means ______________.   I was upset that the ebook file was truncated because I couldn't find out how the story ended.

Pedagogical institutions, including high schools, kindergartens, and colleges, require community support to function efficiently.