Define growth, differentiation, development, dedifferentiation, redifferentiation, determinate growth, meristem and growth rate.

(a) Growth
It is an irreversible and permanent process, accomplished by an increase in the size of an organ or organ parts or even of an individual cell.
(b) Differentiation
It is a process in which the cells derived from the apical meristem (root and shoot apex) and the cambium undergo structural changes in the cell wall and the protoplasm, becoming mature to perform specific functions.
(c) Development
It refers to the various changes occurring in an organism during its life cycle – from the germination of seeds to senescence.
(d) De-differentiation
It is the process in which permanent plant cells regain the power to divide under certain conditions.
(e) Re-differentiation
It is the process in which de-differentiated cells become mature again and lose their capacity to divide.
(f) Determinate growth
It refers to limited growth. For example, animals and plant leaves stop growing after having reached maturity.
(g) Meristem
In plants, growth is restricted to specialised regions where active cell divisions take place. Such a region is called meristem. There are three types of meristems – apical meristem, lateral meristem, and intercalary meristem.
(h) Growth rate
It can be defined as the increased growth in plants per unit time.

Growth: A permanent and irreversible increase in size of an organ or its part or even of an individual cell is called growth.

Differentiation: The process which leads to maturation of cells is called differentiation. During differentiation, a few or major changes happen in protoplasm and cell walls of the cells. 

Development: All the changes which an organism goes through during its life cycle become parts of development. In case of a flowering plant, right from seed germination to seed bearing, each stage is a part of the development process.

Dedifferentiation: A differentiated cell can regain its capacity for cell division under certain conditions. This phenomenon is called dedifferentiation. Formation of interfascicular cambium and cork cambium from fully differentiated parenchyma cells is an example of dedifferentiation.

Redifferentiation: A dedifferentiated plant cell once again loses its capacity to divide and becomes mature. This phenomenon is called redifferentiation.

Determinate Growth: When growth stops after a certain phase, this type of growth is called determinate growth. 

Meristem: The plant tissue which has the ability to divide is called meristematic tissue. The region with such tissues is called meristem. 

Growth Rate: The increased growth per unit time is called growth rate.