Wordnet 3.0
ADJECTIVE (1)
1. 
 being of the nature of a notion or concept; 
- Example: "a plan abstract and conceptional"- Example: "to improve notional comprehension"- Example: "a notional response to the question"[syn: conceptional, ideational, notional]
The Collaborative International Dictionary of English v.0.48:
Conceptional \Con*cep"tion*al\, a.
   Pertaining to conception.
   [1913 Webster]
WordNet (r) 3.0 (2006):
conceptional
    adj 1: being of the nature of a notion or concept; "a plan
           abstract and conceptional"; "to improve notional
           comprehension"; "a notional response to the question"
           [syn: conceptional, ideational, notional]