Conference of Parties (CoP):
The plenary and ultimate decision-making body of the Convention, the CoP meets every two years in an ordinary session.  A country automatically becomes a member of the CoP when it accepts/approves/accedes to/ratifies the Convention.  See Article 22 of the Convention for details on the CoP’s main responsibilities. 
Source: Convention on the Protection and Promotion of the Diversity of Cultural Expressions.
Cultural activities, goods and services:  Refers to those activities, goods and services, which at the time they are considered as a specific attribute, use or purpose, embody or convey cultural expressions, irrespective of the commercial value they may have. Cultural activities may be an end in themselves, or they may contribute to the production of cultural goods and services.
Source: Article 4.4 of the Convention on the Protection and Promotion of the Diversity of Cultural Expressions.
Cultural content: Refers to the symbolic meaning, artistic dimension and cultural values that originate from or express cultural identities.
Source: Article 4.2 of the Convention on the Protection and Promotion of the Diversity of Cultural Expressions.
Cultural diversity:  Refers to the manifold ways in which the cultures of groups and societies find expression. These expressions are passed on within and among groups and societies.  Cultural diversity is made manifest not only through the varied ways in which the cultural heritage of humanity is expressed, augmented and transmitted through the variety of cultural expressions, but also through diverse modes of artistic creation, production, dissemination, distribution and enjoyment, whatever the means and technologies used.
Source: Article 4.1 of the Convention on the Protection and Promotion of the Diversity of Cultural Expressions.

Cultural expressions: Those expressions that result from the creativity of individuals, groups and societies, and that have cultural content.

Cultural industries:  Industries that produce and distribute cultural goods or services.
Source: Article 4.5 of the Convention on the Protection and Promotion of the Diversity of Cultural Expressions.
Cultural policies and measures:  Policies and measures relating to culture, whether at the local, national, regional or international level that are either focused on culture as such or are designed to have a direct effect on cultural expressions of individuals, groups or societies, including on the creation, production, dissemination, distribution of and access to cultural activities, goods and services.
Source: Article 4.6 of the Convention on the Protection and Promotion of the Diversity of Cultural Expressions.