wit
"The seat of consciousness or thought, the mind: sometimes connoting one of its functions, as memory or attention." And in this case specifically means the verbal ability to make people laugh, and it showed at this time Elizabeth had the ability for a while to entertain the people around her with her wit. (OED).
thither
"To go toward a place." (OED).*
silliest
"Senses relating to worthiness or blessedness." (OED).
felicity
"A state of happiness or pure bliss." (I only knew this to be a name at first.) (OED).
chaise
"A light open carriage for one or two persons, often having a top or calash; those with four wheels resembling the phaeton, those with two the curricle; also loosely used for pleasure carts and light carriages generally."(OED).
tête-à-tête
"A private conversation or interview between two people." (OED).
sensible
Being aware of ones doing and being conscious of it. "Perceptible by or through the senses." (OED).
Netherfield
Netherfield Park, otherwise the place in which the Bingley's estate is at.
Longbourn was only one mile from Meryton
Longbourn where the Bennet estate is located. Meryton, both being a fictional places, where Mr. Bennet had been an attorney at and was a place in which the soldiers (redcoats) were boarded.
Mr. Bennet’s property consisted almost entirely in an estate of two thousand a year, which, unfortunately for his daughters, was entailed, in default of heirs-male, on a distant relation; and their mother’s fortune, though ample for her situation in life, could but ill supply the deficiency of his. Her father had been an attorney in Meryton, and had left her four thousand pounds.
Women could not inherit the money that their fathers/husbands made and would have to go to the closes male heir. Thus one of the main reasons in which Mrs. Bennet wanted to marry off her daughters so quickly, and especially those with money so they would be well off. Source: www.janeaustensworld.wordpress.com/2007/11/27/the-fee-entail-in-pride-prejudice/
regimentals of an ensign
This would be the uniform of the lowest ranking commissioned officer. This also come in the form of a 'red coat' as stated later by Mrs. Bennet who had taken a liking to one. Source: http://www.bookdrum.com/books/pride-and-prejudice/448/bookmark/34502.html