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Mobile Adhoc NETwork (MANET) is a multi hop wireless network which consists of mobile nodes that communicate with each other through wireless medium. Many researchers are proposed different solution to improve networks performance in terms of effective routing, transmission delay, throughput, Control overhead and stability. Existing research works are mainly focused for creating efficient collaboration between nodes of a network. In MANET, the mobility of nodes provides an opportunity to change network topology that increase control overhead of a network. Clustering mechanism is played crucial role in MANET to improve the networks performance. We proposed an Efficient Hierarchical Cluster based Routing scheme that uses agglomerative hierarchical clustering technique to form stable clusters. It used the various distance metrics like Unweighted Pair Group Method with Arithmetic Mean (UPGMA), Unweighted Pair Group Method using Centroids (UPGMC) Unweighted Pair Group Method using Centroids (WPGMC), Single linkage or Shortest distance, weighted pair group method with averaging (WPGMA) and Inner squared distance to form the efficient clusters that are close proximity. Efficient cluster head is selected based on weight metrics including transmission range, mobility and remaining energy of the nodes. Simulation results shown that the proposed scheme is achieved good performances with respect to Packet Delivery Ratio, routing overhead, total energy consumption. Key Terms: Cophenet Correlation Coefficient, Energy efficiency,Linkage methods, Hierarchical Cluster, MANET

ENHANCING ENERGY EFFICIENCY IN MOBILE ADHOC NETWORK USING AGGLOMERATIVE HIERARCHICAL CLUSTERING TECHNIQUE