meanings are revealed, “from the outside” (Lewis 1929, 102) as modes of “congruous behaviour” (Lewis 1926 [1970, 248]), drawing distinctions and making connections in language and other behaviour that are congruent with those drawn by others in our interactions with them
This does seem to corroborate my initial theory he meant overall language and communication
products of evolution with similar needs and powers of discrimination, relation, and judgement, confronted by a common reality mediated through comparable sense experience (Lewis 1929, 91)
I understand what he means by products of evolution, I'm not entirely sure what he exactly means by comparable sense experience. Is this to reference shared language? Or does it pre-date any shared communication, verbal or non-verbal?
benefitting from socially inherited institutions and practices
I find it interesting that this is using socialization in a very modern contemporary view such that he means socially inherited institutions and practices such as governments, any remote advanced society, or shared practices across culture.
Objectively right action is action that the agent is justified on all the evidence in so thinking
In accordance with "criteria or principles of the real, the right, the beautiful, and the logically valid, within the implicit (almost aesthetic) human experience.