The support that people in a group give each other 

To do or say something that stops someone else's plan or action 

something that cannot be expressed in words

an obvious truth

not being able to be touched or measured 

occurring before or in front of something else, in time, rank or sequence.

to use (something) to someone's advantage, such as one's own benefit or a society's benefit. 

To assume as a truthful or accurate premise or axiom, especially as a basis of an argument 

To make better, of improve, something perceived to be in a negative condition

Power or capacity to produce a desired effect, efficiency