Given to moralising in a pompous or affected manner.
Late Middle English: from Latin sententiosus, from sententia ‘opinion’ (see sentence). The original sense was ‘full of meaning or wisdom’, later becoming depreciatory.
“He’s a sententious old man and I’m not listening any more!”
With regard to, or at the level of, orders in a taxonomic system; according to an ordinal number, system, etc.; on an ordinal scale; with regard to order.
Mid 19th century; earliest use found in The Edinburgh Review. From ordinal + -ly.