public function lookup($text)
    {
        $url = $this->getLookupUrl($text);
        $response = $this->sendRequest(
            'GET',
            $url,
            [
                'version' => $this->serviceProtocolVersion
            ]
        );
        if ($response->getStatusCode() === 200) {
            $definitions = $this->parseLookupResponse($response);
            return $definitions;
        }
        return false;
    }