get_page_by_title('Apple')

get_page_by_title('Lime')

get_page_by_title('Apples')

$page_id = get_page_by_title('title');
$excerpt =  get_excerpt_by_id($page_id);

function get_excerpt_by_id($post_id) {
   global $wpdb;
   $query = "SELECT post_content FROM $wpdb->posts WHERE ID = $post_id LIMIT 1";
   $result = $wpdb->get_results($query, ARRAY_A);
   return $result[0]['post_content'];
}

$page = get_page_by_title('title', OBJECT);
echo $page->post_excerpt;
// Wanna get other values? Check them:
// var_dump($page);
// If you need meta values:
//$val = get_post_meta($page->ID, 'key_of_what_u_want', true);