struggle-n; 3 Senses

Sense Number 1: strenuous effort in pursuit of a goal

Commentary: STRUGGLE[+activity][+effort][+strenuous][+pursue][+goal]
NOTE: refers to a goal state, does -not- imply a zero-sum outcome (Sense 3)

The book describes their arduous struggle for freedom from slavery.
It was a struggle to make oneself heard above all the noise.
Her struggles to become a ballerina did not succeed.
The struggle to overcome AIDS and malaria will be a long one.

PropBank: struggle.02
WordNet 3.0 Sense Numbers: 1, 3

Sense Number 2: a physical tussle

Commentary: STRUGGLE[+activity][+fight][+physical][+tussle]
NOTE: refers to instance of a physical fight or tussle

The gun must have gone off during their struggle.
The children's quarrel over the toy ended in a struggle on the floor.

PropBank: struggle.01
WordNet 3.0 Sense Numbers: 2

Sense Number 3: fierce contest, rivalry

Commentary: STRUGGLE[+contest][+zero_sum][+fierce]
NOTE: implies winners and losers in the outcome (different from Sense 1)

A power struggle was going on among the highest-ranking political appointees.
How many people did he step on in his struggle up the corporate ladder?
The history of evolution is a struggle for survival of the fittest.

PropBank: NM
WordNet 0.0 Sense Numbers: 1