sp15tax1.js

$(document).ready(function(){   
  
	var scriptbase = _spPageContextInfo.webServerRelativeUrl + "_layouts/15/";
	
	$.getScript(scriptbase + "SP.Runtime.js",
        function () {
                $.getScript(scriptbase + "SP.js", function(){
                
                	$.getScript(scriptbase + "SP.Taxonomy.js", execOperation);

                });
            }
        );

});

function execOperation(){
	
	var context = SP.ClientContext.get_current();
	var list = context.get_web().get_lists().getByTitle('TaxonomyCustomList');
	var listItem = list.getItemById(1);
	context.load(listItem);
	context.executeQueryAsync(function(){
	
	//Single Value Taxonomy Column
	
	//Label
	var label = listItem.get_item("MyTaxColumn").get_label();
	
	//Term GUID
	var termGUID = listItem.get_item("MyTaxColumn").get_termGuid();
	
	//Type ID
	var typeID = listItem.get_item("MyTaxColumn").get_typeId();
	
	//WSS ID
	var wssID = listItem.get_item("MyTaxColumn").get_wssId();
	
	
	},function(sender,args){
	
	console.log(args.get_message());
	
	});

}