Theory:

Meanings of the difficult words from the lesson "An Alien Hand":
  
S.No
Words
Meanings
1
Underground Below the surface of the earth; below ground
2
PassageA usually long and narrow part of a building with rooms on one or both sides, or an enclosed path that connects places
3
DirectionThe position towards which someone or something moves or faces
4
PermitTo allow something
   5Community The people living in one particular area or people who are considered as a unit because of their common interests, social group, or nationality
6
ForbidNot allowed, especially by law
7
Siesta Rest or sleep had been taken after lunch, especially in hot countries
8
MarchTo walk in a military manner with a regular measured tread
9
Evading Escape or avoid, especially by cleverness or trickery
10
Beckon To move your hand or head in a way that tells someone to come nearer
11
Barred Closed or secured with a long rod or rigid piece of wood, metal, or similar material
12
Underestimate To think that something is less or lower than it really is, or that someone is less strong or less effective
13
Invisible Impossible to see
14
PhotographA picture produced using a camera
15
IntruderSomeone who is in a place or situation where they are not wanted or invited
16
Anxious Feeling or showing worry, nervousness, or unease about something with an uncertain outcome
17
Sample A small part or quantity intended to show what the whole is like
18
Survive Continue to live or exist, in spite of danger or hardship
19
Freeze A period of frost or very cold weather
20
Temperature The degree or intensity of heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch
21
Reservoir A receptacle or part of a machine designed to hold fluid or oxygen
22
ForefatherA member of the past generations of one's family or people; an ancestor
23
SustenanceFood and drink regarded as a source of strength; nourishment
24
HostileUnfriendly and not liking something
25
ExtinctOf a species, family, or other group of animals or plants having no living members; no longer in existence
26
Sufficient Enough for a particular purpose
27
Artificial Made or produced by human beings rather than occurring naturally, especially as a copy of something natural
28
ComfortableRelaxed and free from pain
29
Solar energyEnergy that uses the power of the sun to produce electricity
30
ExcitementA feeling of great enthusiasm and eagerness
31
CrowdA large number of people gathered together in a disorganised or unruly way
32
Trajectory The path followed by a projectile flying or an object moving under the action of given forces
33
Ancestor A person, typically one more remote than a grandparent, from whom one is descended
34
Vantage A place or position affording a good view of something
35
StrangerAn unknown person
36
AnnouncementA public and typically formal statement about a fact, occurrence, or intention
37
Momentous Of a decision, event, or change of great importance or significance, especially in its bearing on the future
38
DefenceThe action of defending from or resisting attack
39
Courage The ability to control your fear in a dangerous or difficult situation
40
WisdomThe ability to use your knowledge and experience to make good decisions and judgments
41
IneffectiveNot producing the effects or results that are wanted
42
Impression An idea, feeling, or opinion about something or someone, especially one formed without conscious thought or on the basis of little evidence
43
Non-interferenceFailure or refusal to intervene without invitation or necessity, especially in political matters
44
Passive Accepting or allowing what happens or what others do, without active response or resistance
45
IntentionA thing intended; an aim or plan
46
Red letter day A day that is pleasantly noteworthy or memorable
47
Impressive Evoking admiration through size, quality, or skill; grand, imposing, or awesome
48
Observe Notice or perceive something and register it as being significant
49
MischiefPlayful misbehavior or troublemaking, especially in children
50
WistfullyWith a feeling of vague or regretful longing
51
GlueBe paying very close attention to something, especially a television or computer screen
52
Emerging Becoming apparent or prominent
53
Prominent Very well known and important
54
IrresistibleImpossible to refuse, oppose, or avoid because it is too pleasant, attractive, or strong
55
Restore To return something or someone to an earlier good condition or position
56
DisappointmentSadness or displeasure caused by the nonfulfillment of one's hopes or expectations
57
Scientist An expert who studies or works in one of the sciences
58
HitchMove something into a different position with a jerk
59
TechnicianA person employed to look after technical equipment or do practical work in a laboratory