'telecommunication' (17 letters) - communication over long distances by cable, radio etc.

'inconsequentially' (17 letters) - of little importance

'hemidemisemiquaver' (18 letters) - one sixty-fourth of a whole note in music 

'incommensurability' (18 letters) - not being comparable in size or value 

'interdenominational' (19 letters) - involving more than one Christian denomination 

'counterdemonstration' (20 letters) - opposition demonstration 

'uncharacteristically' (20 letters) - unusually, being out of character

'overindustrialisation' (21 letters) - excessive industrialisation 

'electroencephalograph' (21 letters) - instrument measuring electrical activity in the brain

'honorificabilitudinity' (22 letters) - honourableness 

'disestablishmentarianism' (24 letters) - opposition to an established church

'antidisestablishmentarianism' (28 letters) - opposition to establishment opposition 

'floccinaucinihilipilification' (29 letters) - act of estimating as worthless

'supercalifragilisticexpialidocious' (34 letters) - amazingly excellent

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