The word militaba is the imperfect form of militar in the first person singular. There are other translations for this conjugation.
See the full militar conjugation

militar

Mi esposo militaba en "Lucha Continua" y escribía en el periódico.
My husband was an activist and wrote in the newspaper.
Hasta ese día el papel de los observadores se militaba a observar y a hacer comentarios, pero sin tener participación en el proceso electoral.
Until that point observers were primarily just that—they observed and commented, but did not participate in the electoral process.
Militaba, cuando era estudiante de la Universidad de Berkeley, en el Movimiento de Libertad de Palabra (FSM), desde su etapa inicial en septiembre de 1964.
Was active, as a student at UC Berkeley, in the Free Speech Movement (FSM), from its beginning stages in September 1964.
El Sr. Baraket militaba en la Unión General Tunecina de Estudiantes y era miembro del Al-Nahda, partido político no oficial.
Mr. Baraket was an activist in the Tunisian General Students' Union and a member of Al-Nahda, an unofficial political party.
Jacques no militaba en ningún partido u organización política. Era más bien un hombre de gran convicción, un animador social, filántropo, amante de la vida y del bien.
Jacques was not a political activist, but rather a man of conviction, a social organizer and philanthropist, loving life and all that is good.
Su esposa, Ana Peláez García, reside en Florida, en la provincia de Camagüey (a unos 80 km. al sudeste de Ciego de Ávila), y como él militaba en la FCDH.
His wife, Ana Peláez García, resides in Florida, in the province of Camagüey (about 80 km southeast of Ciego de Ávila) and, like Yera, used to be a FCDH activist.
Un intelectual público sobresaliente que investigaba profundamente la teoría y la cultura, y al mismo tiempo militaba y abogaba por el pueblo, con una inteligencia crítica coherente: el proletariado le rinde honor a Edward Said.
An outstandingly self-conscious public intellectual who combined a rich understanding and investigation of theory and culture with actions and words which supported and championed the people, all carried out with consistently critical intelligence: the proletariat honors Edward Said.
La experiencia de Pingshan aquí mencionada consistía en invitar a reuniones del Partido, durante la reforma agraria, a gente que no militaba en él, a fin de ayudar a la consolidación de las organizaciones de base del Partido en las zonas rurales. [pág. 197]
The experience of Pingshan here referred to consisted in inviting non-Party people to attend Party meetings so as to help the consolidation of the Party's primary organizations in the rural areas during the land reform. [p. 193]
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