permissˈive adjective

1. Granting permission or liberty
2. Permitted, optional
3. Lenient, indulgent
4. Allowing much freedom in social conduct esp concerning sexual matters (as in the permissive society, said to have been ushered in in most (esp Western) countries by the sexually and socially liberating 1960s)

permissˈively adverb

permissˈiveness noun

permittˈance noun (rare)

Permission

permittˈer noun

permittivˈity noun

1. (absolute permittivity) the ratio of the electric displacement in a medium to the electric field intensity producing it
2. (relative permittivity) the ratio of the electric displacement in a medium to that which would be produced in free space by the same field

permissible dose noun (radiology)

Same as maximum permissible concentration (see under maximum)

permissive temperature noun (biology)

The temperature at which a temperature-sensitive mutant will grow (cf restrictive temperature)