lecture

Steven Pinker: The stuff of thought
http://www.ted.com/index.php/talks/steven_pinker_on_language_and_thought.html

dative case
In inflecting languages, a form that typically express and indirect object relastionship eqivalent to English I gave the letter to the girl; cf. direct object.

inflection/inflexion
In grammar, an affix that signals a grammatical relationship, e.g. case, tense(girl's, walked).

affix
A meaningful form that is attached to another form, to make a more complex word(un-+kind+-ness); cf. infix; prefix; suffix

reciprocity n.(formal)
-The reciprocity relationship between the dishonest officer and the old man continued for a long time for bribery.

I listened to the lecture and tried to take notes. I think I need to listen at least 5 times to understand the content.