F.P.
F.P stands for The Future of the Proletariat, a fictional society "open to all shades of revolutionary opinion" (20).
Havelock
A havelock is a cloth used to cover a military cap that hangs over one's neck. Karl Yundt wears a faded greenish one.
Panjandrum
A panjandrum is a title for a person of great power or influence. Vladimir uses the term to refer metaphorically to science in Chapter II.
tec
Detective.
Ticket-of-Leave
A pass given to convicts that allow them to leave prison for a certain period of time. Used in the novel to refer to Michaelis ("the ticket-of-leave apostle").
Charwoman
A woman hired to do house-cleaning.
Gallows
Ropes from which one is executed by hanging.
Nominally
In name.
Ostensible
Purported.
Era of reconstruction
Major urban construction in the late 19th century in London of streets, squares, sewers, etc.
Impropriety
Inappropriateness.
Alarming
Surprising and worry-inducing.
Contemptuous
Scornful, disdainful.
Deign
To think in accordance with one's dignity to do.
Affability
Friendliness.
Sacrosanct
Sacred.
Fetish
Object of extreme awe and reverence.
Scrupulousness
Carefulness, thoroughness.
Guileless
Sincere, frank.
Augment
Add.